It doesn't matter what he liked because the thing about dementia is that they are no longer themselves.
My mum loved reading magazines-all those Take a Break, Char and so on. Now, she wouldn't even look at them. She liked watching Homes Under the Hammer, Bargain Hunt etc, now they could be on a rolling loop and she might have her eyes on the TV but isn't engaged, couldn't tell you what is going on.
She liked clothes, now she couldn't care less what she has on-has no interest.
That is what is so heartbreaking about dementia. Yes, they are still the person they were but dementia is like a shadow and it creeps over them erasing their personality and their likes and dislikes.
I would say the only thing my mum still enjoys is chocolate which we bring to her and she takes some notice of.
So, don't be disappointed if you buy something that you think they will like and they don't take any notice of-it's not because you've made a bad choice but because dementia is a thief and robs them of their personality.