I just cant get over now...

I wasnt pissed at first but then I got in a funk and now I just cant get over it.

My MIL who is always complaining that I am harder on one than the others and who is always on my hubby that I play favorites is the worlds worst. I have 5 boys, 2 his 1 mine and 2 ours. His 2 are welcome any time they ask or any time his ex ask her to keep them. She never and I mean never tells them no. The little 2 ask to go over there and the answer is not today maybe tomorrow or next weekend. She does always get them few a few hours when she tells them that. We used to ask her to baby sit the boys every so often (not much because well we have 5 boys) but mostly we try to make it where we only need a babysitter for 2 so its not so much work. Of course she lets the other 2 come from their mothers as well so she usually has 4. Well this weekend happens to be one of those weekends but one of the boys is staying home but his dad has to work this weekend. Well its a problem for her to keep him too because she is keeping one of the boys cousins and well you know the other 2 are coming because he is going to be there. Its fine for all of them to be there but adding one more is a major problem. If thats not favorites I dont know what is...She has always been that way and I noticed it along time ago but when the hubby came home asking about why one was staying home and if he had asked and we werent going to have a baby sitter any more I knew something was up. I wasnt pissed at first but the hubby was in a bad mood because of it and the more I thought about it the more it pisses me off.