Deal breaker? SO and mom don't get along

If your SO doesn't like your family and/or your family doesn't like your SO, is it a deal breaker? 
I am incredibly close to my mom, we get along great and she really helps me with my son (I work full time plus going to school part time). My boyfriend (not my sons dad btw) is a great guy. He treats me well, would never abuse me, cheat on me, etc. We've been together 2 years and my mom and bf are just complete opposites and just flat out don't like each other. I'm just so confused... I'm trying to figure out a new living situation. I currently own my home and my mom lives with me. My bf will not move in with me bc she's living here and wants us to buy a house together but doesn't want my mom to come and doesn't want a place with a "granny flat". The problem with that is my mom can't afford a place by herself, plus I can't abandon my mom, especially after how much she has helped me.
Does anyone have advice or been in this situation?