I’ve just about had enough!!😡

Ok so I’m currently going to school working full time and being a mom to a baby boy. I recently moved back in with my mom when my dad passed August 2017 so she wouldn’t be by herself. Well here recently she’s been dating a much older man and which is fine with me, my brother told me she’s been telling all her grandkids to call this man grandpaw..Well I’m sorry but my son WILL not call another man pawpaw! My dad is 6 feet under and I will have him disrespected. Plus it’s just not right. He’s not their pawpaw. Am I wrong for feeling this way?? She’s threatened to kick me and my son out for this. Because she made the remark I don’t “OWE you or him anything!! Which she doesn’t..she’s raised me and I provide everything for my son Keepning i. Mind that she asked me to move in. I really think it’s time for us to leave but I don’t wan to take my son and he think I’m the bad person here