Is it normal to pay for extras on top of CS? Things like birthday parties at moms house, paying for sports, paying for her child care.

Am I crazy or is this the norm? Kids birthday party next weekend i do plan to show up for a few so she asked me to split the whole party and their presents she bought. I already bought my kids presents

She also asking me to drive the kids to and form practice on days she has the kids? And I am a terrible dad for saying if I’m free I will help out but I can’t commit to every week when you have them.