Not too huge a thing but my sister and my mom cannot interact whatsoever and it stresses me out because my mom's house is tiny and you can't get away from it
My sister procrastinates awfully and then gets preemptively defensive whenever anything about it comes up
My mom can't understand how badly she hurts my sister's feelings and just goes on about how she feels
They get in a big 30-45 minute argument every time they see eachother, which is once a week, and I'm always there for it.
Thankfully my sister is going off to Scotland in September