Ooh, that’s a tough one. It’s never been an issue for me since my mother guessed (“feared”, as she so problematically put it, the nasty disgusting SKERF bitch) long ago that I’d grow up to be a serial killer, and I haven’t really spoken to my father since he sent me off to boarding school age 5 (except for once when I was 11, when he yelled at me for stealing his porn collection, and again when I was 14, for burning down his garden shed and filming myself doing it).
Tbqh, I would sit them down, then just come out and say it. Tell them all the gory details! ^_^ Our proclivities and urges are *exactly* like sexual orientation (or would be if such a thing existed, I’m pretty sure same-sex attraction is a myth, it’s just an excuse for so-called “lesbians” to reject me TT_TT). That means they’re obliged to accept your murder hobby exactly as they should accept someone in a happy and healthy same-sex relationship.
If they don’t accept it, or say literally anything other than “I’m so happy for you and I support you!” – prejudiced, bigoted things such as “Are you sure you want to do that?” or “Please keep yourself safe out there” – then don’t hesitate to disown them! You will always have your #HitterFamily ! UwU Dmitry, Guro, Big Dave and all my friends and I will take care of you. We’ll encourage you to go professional and become an assassin right away! (No pressure, but if you wanted to stay in our *~Hitter Family~*, you’d totally do it. Lots of people would love the opportunity. Don’t you want to be friends with us? #justsaying)


