Yes, DD has her own room... but she rarely uses it. She gets annoyed by DS 's "participation" but when I suggest that she could play the same game in her room, she either declines or it only lasts 5 minutes as she prefers to be with us. She will sit up at the dining table to do some things but he quickly cottons on and starts trying to climb up and reach what she's doing.

The only thing that she will happily go off to do without him is craft/draw as I've set her up a table in her room but even then, she doesn't do it for long.

I agree, it seems like a good idea for them to have space. But in my (sample of one) experience, they don't necessarily take it!