Is it normal to feel relieved when your teen/preteen are out of the house, say at a friend's or playing a sport? I've noticed that both DH and I are less focused on having"family time" lately and plan ways to do our own thing more (even if it's just walking the dog together). We happily agree to most sleepovers or afternoons out offered to our children! 
Are we being nasty parents, wanting to have less time with them? We both do certain activities separately with them, which seems to work better as DD and DS bicker constantly.
I'm just really aware that DD (13) will probably be at university in 5 years so I do want to treasure this remaining time with her...but she can be so grumpy and she doesn't really want to be with her middle-aged Mum unless I'm paying for something or she's got a problem she wants to share. 