Nadya, that's probably going to come up when I eventually discuss being poly with my mom. Her worry/argument will be that it's detrimental to my husband/marriage, regardless of how many times MC has said he's fine with it, so I'm going to have to just leave it to him to convince her (or not) of his feelings. My position will remain that it's not much different (perhaps even better!) from my sister's divorce and subsequent relationship with her current boyfriend. If my mom can learn to deal with one (to be fair, she had a hard time dealing with sister's divorce) she can learn to deal with the other.
Pan Female, Hinge in a V between my mono (straight) husband, Monochrome and my poly (pan) partner, ThatGuyInBlack