Help with nickname, please!!

Su

Hi, everyone! I am 38 weeks and I still haven’t figured out how to refer to my son. He is named after my husband, who is named after his dad. My son’s name is going to be Thomas Alexander. I can not figure out what to call him because I call my father in law, “Tom,” my husband, “Thomas,” and they don’t like “Tommy.” This is going to be a confusing household if I am talking to my son and my husband responds. I want two distinct names.

Could you help me with this? Maybe use the middle name or something.