I enjoy humiliating myself and seeing people's reactions to things. So I've told all of my close family and a select few distant relatives about my interests.
I've showed my family Katawa Shoujo, the Atelier series, Project Diva, some anime porn mods for various games, I've watched K-On! with my mom and my little brother, etcetera.
I've also explained the concept of waifuism to my mother in great detail and showed her my own husbando. Her response to it was underwhelming, probably because she's just used to this sort of shit now.
None of them give a shit.
The only time anyone in my family has laughed at me is when I told them I was a brony years back. I'm not anymore, I dropped that shit show and was only into it in the first place because my two only friends were at the time and I wanted to be able to talk to them about it, honest.
They seem to have forgotten entirely about that phase though, luckily.