I think there might be arguments!

Thank you so much everyone for your very helpful suggestions. I have now decided to prepare dishes to suit everyone, and to tell them that the first person to start an argument will be shown the door!
They are very good children, and always kind to me, but they do enjoy a good set-to over this particular issue. I don’t enjoy it, and it’s my home, so they will have to shape up!
Some very good suggestions for recipes and further reading, also, so my rant has been much more useful than just a chance to let off steam!
You are a lovely lot, so I hope you all have a Cool Yule and a blessed New Year! X

Good luck sluttygran I am sure they will all appreciate your efforts. I hope you have a lovely family Xmas.

sluttygran I am glad you have a plan!

It sounds like you hit the nail on the head - they enjoy the argy bargy about the subject! As a member of a family of opinionated people, I completely get this. The problem is that outsiders don't realise we're not going to start with the fisticuffs!

This is going off topic, but my Dad stood in for someone at our office quiz once and I only found out the next day that sometimes our team mates daren't say a word when me and my Dad were 'discussing' the answers! That was the first time I realised not all families were so vocal! In fact, when I was having speech therapy I had to learn not to speak before breathing in. I had grown up speaking on my 'residual' breath and this habit developed from childhood through speaking at a point where I could get in my 10p's worth! I told my brothers and they too realised that they spoke on their 'residual' breath and it was a real eye opener. It's a hard habit to break though, so I wish the OP the best of luck!

I would point out that constant nagging and preaching is the last thing that is ever going to convert people to her point of view. If she can be relaxed and cheerful and accept other people's views they will begin to think what a pleasant person she is and might like trying a few of her ideas.

Whose home is this?!!

I notice there are far more negative comments, on here, about the possibility of DD (vegan) causing difficulties, rather than DS (meat eater).
Either seems equally likely, to me.

Quite right, sluttygran to tell them both to behave.

I've cooked meals for part-veggie (i.e. eat fish), veggie, vegan, non-living foods (i.e. vegan & no yeast) and Muslim. I keep spoons & cooking utensils separate. I cook veggie for the Muslim friends because I disagree with halal practices. However, when I go to veggie etc houses I'm served their veggie etc food - and I always say "very nice" - at the Muslim household I'm too polite (scared of appearing racist?) to refuse halal meat. I was brought up to be a good host to guests and as a guest to be good to the host. Maybe when I start to lose my marbles I can be rude & say "not bl**dy lentils again! ?

I wouldn't eat meat, but I always say how lovely it is to have someone cook for me. There's usually plenty of other things to fill my plate with. Very occasionally I come across someone who thinks a veggie only eats vegetables!

FarNorth, the OP actually said that it was the vegan daughter who was likely to have a hissy fit. That's why many replies are responding to this.