Am i just being silly? Or could i be right?

Here it is, the weekend. Tomorrow my mom will come and get Leigh Ann like she does most weekends, and my son Seth will be stuck at home with me and hubby. I don't think that my mom means it this way, but i feel like she favors Leigh Ann over Seth. It wouldn't be unlike my mom to favor one child over another. Hell when my lil sis and i were growing up my mom always favored Marissa. That little pain in the a$$. Anywho. I have talked to my mom about why she only takes one and not the other. She says it is because her car is small and it's difficult to put 2 car seats in the back. Yeah i guess i get that. But why not take Seth one week and Leigh Ann the next. She won't even ask to take him. The only time she has ever kept Seth for me is when hubby and i went on vacation last year, and occasionally on our anniversary. I'm just afraid that she is setting my kids up for sibling rivalry when they get older. And i don't know what to do about it. I can always tell my mom she can't have Leigh Ann at all until she can make time for Seth. But knowing my mom she would read too much into it and this whole family war would start. We haven't had a giant family war in over a year, so i guess it's about time for another one! haha. I don't know. Maybe I'm just making too much out of nothing. But i am a big believer in a mother's intuition. And if i think it's more than nothing, I'm sure it is more than nothing. Ahhh. I think i will have another talk with my mom soon. I will keep everyone posted on the outcome. But if you see me on the news being arrested, i might need some bail money! lmao.