Ok, I got one. When DS was about 9 mo. old we went for a weekend to visit the in-laws (his parents). DS was cruising furniture at the time. Well......SIL and BIL (who live in the same town as his parents and are the golden children - mind you I could care less, just relevant to the story) came over with their dog. A ****zu (sp?) who is horrible. It bites everyone except SIL, BIL and DH's parents - who "babysit" the dog. Well, DH and I had had a discussion prior to going up there about the dog.
I made it clear that there was no way I was going to let the dog bite DS, and we would just ask them to put the dog in another room, or gate the family room off.
We never got the chance. When we arrived, we were promptly told that we needed to stay in the LIVING room away from the dog.
So, the dog got the run of the house and we were stuck in a room the whole weekend with no tv, while everyone else - their whole family - was in the family room enjoying each others company. DS walked for the first time that weekend - did his parents care? - nope, too busy with the dog.
Seriously, the whole weekend. I can't tell you how that makes me feel. Knowing that his parents love a **** dog more than their own grandchild.

BTW, there are countless other stories along the same lines to back up my hypothesis.
And DH wonders why I have an issue with his parents