I'd like to know where Heather slept, hana

The trivia section says they didn't show Kevin's room on purpose so the audience would feel hes really more so home alone.

I actually think Kevin didn't have his own room and shared with his parents.
Not their bed, lol but their room.

There's actually a deleted scene where Kevin asks Linnie what happened to his room when she tells him he has to sleep in the attic with Fuller. She tells him that two of his cousins took it, so that explains that he does have a room, we just never see it.

Maybe that was where he slept, which was why he was sent up there. Or the other visiting relatives needed his room for some reason. But this film wasn't realistic to begin with.

I have to agree with you on that would be why Kevin would be surprised there is another floor, or he could have just been acting like he was dumb. But if that was his regular bedroom why would he be surprised there is another floor, in less he was really was playing dumb?

I never sleep in my parents room.
I used to do that whenever I could as a kid. The bed was better, and I guess I felt safer there.

There have been lots of times when guests came over, and I let them have my room, sleeping in another room or couch. It's no big deal, as long as I can sleep. It's probably what happened when his family visited. But, it's weird while his parents were away, he only slept in his parents room. I never sleep in my parents room.

Because Frank's family had just came into town that morning. Kevin's mom tells Harry that when she's taking Kevin upstairs after the incident in the kitchen. That's probably why Kevin was surprised to learn that.

You have 2 couples (Frank and Wife and Kevin's folks) then Heather being an older cousin and not a brother or sister of anyone likely she gets a room, so I can see why Kevin moves - however it seems he wasn't expecting it as when he goes up he's surprised to see he's going up the the 3rd floor

Totally agree.

That would make a lot of sense

Uncle Frank was staying in Kevin's room. Yet another reason to hate the selfish old bastard!

No in fact I believe I remember the trivia section pointing out that despite him home alone he was never seen in his room. So we don't know if he had his own room, or had to share it anybody? But as far as the hide-a-bed with Fuller that part is never explained why. So your guess is as good as mine if not even better then mine.

That's what I figured. Buzz is the eldest so gets his own room. Kevin and Jeff share a room. According to this
http://1cqgxm3l59yi2wwbnn3qy35h.wpengine.netdna-cdn.com/wp-content/uploads/2009/11/Home-Alone-house-floor-plan-upstairs1.jpg
there are four rooms and an office/unknown. If the office is actually a bedroom it's possible the two girls had one each, otherwise they also shared.
I've had a lot of sobering thoughts in my time Del Boy, it's them that started me drinking!

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Kevin was sent up there as punishment for misbehaving at dinner. His actual bedroom may have been free, or possibly he shared with the ginger guy. Were they brothers?

Yeah, that's exactly what I was thinking. I can see why people wondered, "why couldn't Kevin keep his bedroom spot, and his cousins sleep in the attic?" However, it was a respect thing. Rather than make older female cousins sleep in the attic, they got a bedroom while Kevin and the youngest boy cousin had to share the attic. I don't know where the aunt and uncle slept or the older cousins, but shuffling of rooms is pretty common when relatives stay over, especially when trying to give better sleeping quarters to older guests.

It is not unusual for a boy to have to give up his room for relatives. I had to do it every year since I was 13 when my parents bought the house they still live in now.
Green Goblin is great!

I always thought he said it was scary, so he didn't have to go to his room.
I actually thinks it looks quite cozy, and perfect for a boys room. But like someone else said he probably shared room with his brother Jeff, and the attic is where the hide-a-bed was.

I don't think it's his room, he says how scary it is and nobody is afraid of their own bedroom.
I'm guessing he is sleeping up there so that a family member can sleep in his bed, which does seem odd because the house seems big enough for guest rooms on the main floor and failing that, they can at least afford to make the third floor into a nice guest area. It looks horrid up there, doesn't fit the rest of the house and I certainly wouldn't sleep up there.
Noone I think is in my tree, I mean it must be high or low