Does anyone find this odd/creepy?

yes, like Elrel, snoring was the only problem!

Oh dear, we shared a cabin with daughter on a cruise otherwise she would not have been able to afford to go.
It was a cabin for four people.
Are we creepy?

I don't see anything wrong with it. What constitutes a decent period of mourning? Maybe the death of his wife and her mother have made them realise that life is too short to be estranged from family. .

Time away from the distractions of normal life seems a wonderful way to rekindle the dad/daughter relationship.

Not in the least creepy and I wonder why you consider it to be any of your business. The line about him also going in June but you don't know who with....yet shows an unhealthy interest in my humble.
Good luck to them I say

As others have said, why not. A great opportunity to mourn and to talk.
Some years ago DD and her husband visited from Oz. SiL, an architect as was DH, had never been to Paris so they took off for 3 days to 'look at buildings'. ( a euphemism for eating and drinking probably). They got a surprise at the hotel as they had been allocated a double bed. DH did put his foot down about that. SiL was very tall (and young) and DH was very short and not so young, so it was a case of 'The Odd Couple'. DH took DD1 to Lisbon when she was in her twenties and they shared a room; she had to wear earplugs ?

I hope they have a good time!
In a lovely quirky hotel in Kent DS booked a 'family suite' which turned out to be huge double bed in one room, long narrow room with 2 singles end to end in another. We were only there for a weekend. Sun shone, sea and sands lovely, hotel staff friendly and obliging. No chance to change rooms, popular hotel was full.
Two young GDs liked their luxurious double and son and I shrugged and slept in the 'passageway room' single beds. It had been assumed that we were a couple with 2 children rather than mother and son. Snoring was our only problem, modesty was preserved.

When we had a property in Spain my sister in law would regularly share a room with her brother - nothing creepy or untoward, just practical.

Not at all creepy- as others have said, it would be a lot of money to lose so why not take his daughter?

Not the least bit creepy. My DH wouldn't hesitate to share a room with our DD and would be shocked if anyone were to think it creepy.

They will still be in mourning and this holiday will probably give them time together to share memories of their wife and mother. Mourning doesn't have to be all sackcloth and ashes. Everyone gets through it in their own way.

What's creepy about a dad taking his daughter on a holiday? Cruise cancellation policies differ tremendously and he could be looking at losing 50% or even more of his money. My friend regularly took her adult son on holiday because her DH didn't like to fly and they shared a room, was that creepy?

No, not creepy, and not really anyone else's business.

I find it hard to feel anything creepy about this. It's not ideal to be sharing an inside cabin, (a bit cramped) but apart from that I think it's fine.

Inside cabin is confining and cramped. Sharing with your father?? I just couldn't imagine going on a holiday booked for the two of us - surely a decent interval of mourning would be appropriate??

What is creepy about it? Unless you suspect something untoward is going on with the daughter? Whats the significance of an 'inside cabin'pray?

He's making up with his estranged daughter by taking her on a cruise?

I don't think that's creepy at all. He is attempting to fill a huge gap in his life in a nice way by the look of it.

Yes I think you ABU, why shouldn't he take DD ? Probably a chance to relive memories and console each other.