So while I was browsing forum topics and whatnot yesterday I realized that I was setting my self up. Why didn't I think of it before? Was I so blind?
I didn't plan for a what if scenario. What if the SD was going to be at the MIL for the traditional Mother' day BBQ?

Oh GOD! I will not allow my self to be subject to that thing on a day where I should be spending it with MY family.
So I called up my mother. I don't ask my mother for much. BUT I BEGGED!!!!! "please mom! let me hang out at your house on sunday"
Never in a million years did I think I would have to "hide out" at my mother's house. So my mother and I devised a plan. I will casually inform my husband that my mother would like it if I brought the kids over for a while on mothers day. (my mother and I are not that close, so I'm really going to have to sell this). I think I can do it. I have been calling my mother every day in preparation for this. My mother has seen first hand how the SD is. Hell my own mother wont let them over to her house either. (long story). So my fingers are crossed that I can pull this off.