Serious cat dilemma

I would not bother with cat behaviourists or any other ' solution ' hope your DD can bite the bullet and find a new home for one of them . It will be very hard I know that ! but needs must.

This is a very difficult situation and your your DD has my understanding. Putting one to sleep is not necessary, the most sensible and kindly thing to do is re-home one of them . If the second cat is found a new home the first may revert to his original behaviour - no guarantee though! Alternatively re-home the original cat . Very hard decision I recognize that but IMO one of them must go and in your DD situation I would re-home the second cat. Cat pee on furniture and clothing is a definate NO NO! Your DD must not feel guilty, rehoming is the obvious choice! She is not to blame for this , the first cat is clearly not happy and feels threatened - which ever is rehomed will be a kindness to both of them . I hope all goes well.

I've already said that our two elderly Maine Coons wouldn't take easily to another cat and she would struggle to cope with them as well as a whole new home and no access to outside.
The Feliway diffuser wasn't any good as they'd need hundreds of them but maybe a collar would be worth a try.

Tricky problem, and happens more than many folk would think, but cats aren't dogs and won't necessarily think "whoopee, another cat to play with". The comments from Calipso and VioletSky are sensible and accurate. There was a show called (?) "My Cat From Hell", (possibly still on Animal Planet, or similar channel?) with an American cat behaviourist, dealing with a whole variety of cat issues. Many cats in the States live as indoor cats, and the "warring cats" syndrome was one he dealt with occasionally. It's ages since I saw that show, but the solution (to try and keep both cats) requires some work, which not every human will do, but it's worth a try. One method involves mealtimes, making sure that #1 cat gets fed first (even by just a few seconds, it's a symbolic thing) and also that they can eat quite close together, though if necessary separated by a barrier, but so they can still see each other. Other factors involve where they like to hang out, so each has their own space (this is complicated by some cats shifting their preference every week or two!). This type of info and more should be available somewhere on the i'net, you've just got to find the right phrase to Google (warring cats?).

Try Feliway room deffuser and collar for the first cat but if this doesn't work the second should be the one to be re homed.
Ragdoll's are a very popular breed and there may well be a website specifically for the re homing of that breed.

Please don't restrict cat 1's access to the house, that would be unkind. They're an extremely sociable breed who love human company and doing so would merely result in increasing the cat's levels of stress and anxiety.

Look into FELIWAY, I used the collar and room diffuser when someone else's cat kept inviting himself into my house. Naturally my cat ( 5 years old, neutered girl) hated this male, entire male cat made himself at home. I used Feliway for about 3 months, until the collar and diffuser needed renewing by then both cats were calm with each other. Good luck. hugs

Are the areas sanitized with products that erase the enzymes?

Those enzymes indicate cats that is a peeing area

If removing, cat no. 2 is the one to go.

You are lucky in some ways that he is a Ragdoll so he will be very easy to rehome. Ask a local rescue to help with rehoming as they are very used to those awful people who want cats for baiting - please don’t be fooled these people are very adept at “adopting” cats and seem genuine. As someone else has said cat rescues are totally full with numerous kittens arriving in rescue. For those on Facebook it is so sad to see rescues pleading for funds and food for these unwanted animals. Something has to give and sadly it is the older black cats which are euthanised - this is fact!

I would, very reluctantly, find a new loving home for the second cat.

The younger cat needs to be rehomed, not the older one. Will you take it Aveline?

Could you have the younger cat Aveline?

He is a neutered Tom and has been cleared by the vet. No physical problem. It would be easier if there was. I don't know what will happen. There's nothing I can say other than to be sympathetic as DD starts scrubbing again.

Aveline As I said upthread, Cat No. 1 needs to be checked by the vet to see if he has cystitis/kidney problems causing his weeing everywhere. He may just need some treatment to put him right, poor little chap.

Aveline

Of course I didn't consider 'killing him'!! I put it there as a last possible resort. I was trying to consider all possible things she could do. They're getting desperate. He's just peed on the clean pile of clothes out for packing for DGS's first school trip away.

I asked upthread. Is he a neutered Tom?

If I took cat 2 then my own bruisers might start peeing. Also she's an outside cat and we live in a fourth floor flat. Our boys have never been out.
The prospect Calipso raises is chilling. I'm sure she's right though. It is a terrible risk.
Rehoming cat 2 isn't an option either as her DH and sons love her and she's very friendly. It's only poor old cat 1 that's a problem. If only they hadn't got a kitten two years ago. . It's a real dilemma.

When I was little we kept one of our cat’s kittens which was supposed to be mine. However first cat did not get on with her offspring so “my cat” was rehomed. I knew where she went and she was well looked after but I never did like first cat after that.

Would it be possible for you to take the 2nd cat for a short stay to see if the situation improves? Depending on what happens make a decision then. How old is first cat, could he have developed a physical problem or illness?

I always have x2 cats all my married life always female.
Not one pair has been friends as such, they all have kept a wide berth of each other, occasionally have a punch up but nothing significant.
I have used Feliway, and you can (or could) on Amazon buy" Chill out" Cat collars, worked on one of my Cats who was over grooming with stress.
Good luck

Can I please add a caution Aveline?

If she is unwilling to consider some of the very good and humane solutions suggested above, please make sure that if your daughter goes along the rehoming route for either of them, that she considers the pitfalls carefully. Cat rescues everywhere are full to bursting but she should seek advice from someone local to her about finding a safe and loving home. So many times cats are advertised as 'free to a good home' and end up as bait for dog fighting. They use plausible women with convincing stories to obtain cats for this purpose. Its horrific.

It's Cat No. 1's home and he was there first and is devoted to the DD. No way should he be rehomed, and I feel shocked and tearful that euthanasia would even be mentioned let alone considered.

Meanwhile he needs to be checked by the vet as cystitis is very common with stressed male cats, and he is clearly very stressed.

Cat No. 2 needs to be rehomed. She is the new arrival and as you say she is "uncomplicated", she is more likely to settle in a new home, whereas a change of home will finish off Cat No. 1. I feel really sorry for him, bless him. He's showing his distress in the only way he knows how.

Of course you must re-home one of them

Could you take the second cat and hopefully cat no 1 will stop peeing once he has his territory back? May require retraining to outside/litter box as he now thinks it's acceptable to go anywhere plus the scent markers will tell him that he's used that location to wee. I would suggest removing cat no 2 (to you preferably) steam clean carpets and anything else he's used as a loo, placing multiple litter boxes around the house and make sure he has free access to outdoors. If he does settle down perhaps you could try a gradual reintroduction of cat 2, but be prepared to rehome no 2. Your dd has my sympathies - we've just had to have our beautiful 15 year old Persian pts with stage 4 kidney disease. She had virtually no control left and we had puppy pads and litter trays everywhere. Hope dd can work something out.

‘Rehome? Euthanise?’

You said it.
That’s the reason why I (and others) mentioned it.

Of course I didn't consider 'killing him'!! I put it there as a last possible resort. I was trying to consider all possible things she could do. They're getting desperate. He's just peed on the clean pile of clothes out for packing for DGS's first school trip away.

BlueBelle

Killing him is unthinkable as is making him live alone in the laundry room, how cruel
Find the new one a new home The boy was there first and is devoted to your daughter it’s very unfair to think of getting rid of him because a better one has come along !
This hasn’t been thought through at all

I totally agree.
I can’t believe that you even considered killing the cat.
That’s just awful