The good news is that when you need advice, you can still call your mom. Even when you're old (as some of my least favorite children like to remind me).
The bad news is that your mom can empathize and give advice and validate and then tell you parenting really doesn't get any easier.
The good news is when your sister calls, you can tell her about things and she'll laugh with you and at you and make you happy.
The bad news is that she always sides with your children. You would think sisterhood would trump her aunt duties but...apparently not.