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Yes it is if the nineteen-year old is not disabled.
Yes.
It is not illegal for siblings to share a room. Age has nothing to do with it.
It will depend on the jurisdiction. In most, it would be a crime for them to have sexual contact and the mother is promoting a crime.
I would think, that if you HAVE the extra room, it would be a good idea for them not to share. If you only have one room for them, they will have to get used to the idea. I shared a room my entire life. When I was two, I shared with my eleven year old sisters and my five year old sister. We got along fine. But, like I said, if there IS an extra room for your oldest daughter, I would split them up. No way she would need her space!!!!!!!!!!!!!!!!
no
i dont think its a good idea... they may fight and you will not like that, no i whould'nt be a very good idea
No!
not where i live
It's legal if they're brother and sister, maybe.
There is no law against it. It might not be the best thing, but sometimes the family has no choice.
It would not be very suitable due to the childrens ages. They should have their own bedroom each.