Telling family

Getting advice online isn't always a good idea. I haven't been diagnosed but I do suspect I have it. I'm probably entering stage 2 territory, but my mom has been struggling with weight all her life. She's a lot more progressed than I am. If I do get diagnosed (I don't think I'm ready yet for that. Just trying to live my life normally while maybe adding some things that could help me in the meantime), would it be on me to tell her she may have it as well? Truly breaks my heart to think of. My darling mom. Thankfully she isn't in pain, not from her fat at least. Has anyone had to tell a family member?