Very few people seem to have a really decent relationship with their PIL.
With me, an awful lot of it comes down to boundries, and their lack of respect for mine. For example, my PIL think nothing of walking into my house without knocking (they have a key, given to them for EMERGENCIES), going through our drawers, answering our phone (and in fact freely giving out our phone number without our permission).
A lot of it is, I think, that they see the house as dp's, not mine (WHY I do not know, it is in joint names and until I became a SAHM I paid 50% of the mortgage )
And then there is the endless "in our day...because of course we know everything..." comments.
And also FIL is very sexist, and bascially a boor. But that is a WHOLE other issue.
I think this is a very common problem, and am genuinely interested in hearing how it is from the other side...
(of course you are probably all LOVELY grannies and thusly don't even know what I am talking about...)