It's like that for us at my own parents' house. The TV is on all the time, and while I find myself able to ignore it, and my kids pay it very little attention, poor DH is like a zombie the whole time. He just can't help but watch, and it makes him cranky and headachy.
I tried hard to get my mom to turn it off when we were visiting, when DD1 first came along, and all I did was offend her. Honestly, it's not her, it's stepdad, and I can't tell him what to do in his own house, and it doesn't bother me enough to say I won't go there. It's just not that important to me-- a few hours a month is nothing.
I have pointed out to my mom how DD's behavior deteriorates with too much TV.
I'll give them credit that they at least monitor the content a bit when we're there, and put on nothing I'd call totally inappropriate.
me , he , my three , , and -- and the one we lost