Should I wash these huge pile of dishes even though they aren't mine?

My mom is out of town for three weeks…and I always end up being “the cleaner”. Came home and saw the sink PILED with sooo much dishes! It’s not mine…I don’t know who’s it is…probably brother’s, sister’s, dads, and no one is cleaning it.

I want to wash it but I don’t want to always have to do everyone’s dirty work. I’m already having to wash my brother and dad’s clothes while she’s gone…even though my brother is 20!