My DSD never tidies her room, hardly brushes her hair, goes to sleep when she wants at weekends, has no restrictions to her computer use (17 years old). My DS (11) has to do a quick tidy of his room most days, gets flack from me if his hair is a mess, has regular bedtimes, restrictions on computers and more. They both are resident with us and I'm a SAHM so with them most of the time.
I've put my foot down over somethings - DSD must brush her hair (for her own self esteem if nothing else), and rudeness but have met SUCH opposition from her every time, and little understanding/back up from my OH who either doesn't see the point or just tells me to ask her to do stuff if I want.
I don't think it's healthy to be so different, and it's like the girl isn't being parented an awful lot? It's like there are these big gaps, and it doesn't seem fair on my son who is really understanding.