B.S.
My sister and brother in-law did the same thing with their kids...all THREE of them. their oldest is 4 and they JUST got him out of their bed about a month ago...they were going to try to get all of them out at the same time but she doesnt want the all crying for her at once( I would have never put my kids in bed with me anyway, I think it is just the parents being lazy and not wanting to get out of bed to deal with their kids) Anway, my other sister in law let her son sleep with her and when she was ready to put him in his bed she just put him in there and he was fine....so I guess it just depends on the kids, rather or not it is going to be an easy transition. The only thing I an tell people is, start them off in THEIR OWN BED and dont be lazy, get up and go to them so you dont make it harder on yourself later. I have 2 kids that have slept in their own beds in their own rooms. It took a few weeks for them to sleep through the night but by the time they were 2 weeks old it was routine. They are 7 and 9 now. No one is scared of the dark, or afraid of monsters.
just my thoughts on the whole thing. Good luck to your friend.