Choosing Between My Mom & Childs Father

Soo I Am 8 Months Pregnant Me & My unborn Childs Father Split A few months back he now is in a new relationship and has another baby on the way. He hasn’t been here throughout the pregnancy hasn’t bought the baby anything and hasn’t helped pay for anything for the baby shower. So I tell my mom he’ll be at the shower she gets upset and says she isn’t coming 🤦🏾‍♀️ so do I just let her be mad and miss her only grandsons baby shower or do I tell my Childs Father not to come? I mean he is still his dad but we have been through a lot but I feel like it’s not my moms decision to make it’s my child and I have to deal with him for the next 18 years WHAT TO DO????