I brought it up with my mom again this holiday too. I think it was when there was the Mormon family on Dr. Phil, so I got my mom to watch it with me and casually mentioned that Erwin and I also practice non-monogamy, but a different kind, not polygamy. She didn't shut me own about it this time, and while she still maintained that she couldn't live it, she didn't say anything about it being bad for us.
“As I am sure any cat owner will be able to tell you,
someone else putting you in a box is entirely different
from getting into a box yourself.” —bisexualbaker