While it's not my parents, I did get my Nana to watch Black Cat with me once, this was our conversation:
Me: Nana, I'm cosplaying this guy (Lin Xiao Li)
Nana: That's a guy?
Me: yes, that's a guy. A guy with a magical rainbow scarf of doom.
Nana: He's very Pretty, now who's the green haired guy?
Me: That's Sven.
Nana: Who's him in your group?
Nana: Don't smoke. It's bad for you.
Me: I know Nana, I have paper cigarettes.
Nana: Good. Now that's the guy your friend is cosplaying, right? That you made the gloves for?
Me: Yes Nana, that's Jenos.
Nana: And who's this lady?
Me: That's Echidna. She's Creed's Henchwoman.
Nana: Is anyone her in your group?
Me: I also agreed to be her.
Nana: She's pretty. Now which one's Creed again?
Me: The one with the really weird laugh.
Nana: Oh yeah, him.
Me: I'm gonna cosplay him as well.
Nana: ...you better wear something under that.
Working on:Raffaele Laurent Bessette-The Young Elites(New Outfit,) Decim-Death Parade, Akoya Gero-the Magical Boy anime, Makoto Kowata-Flying Witch, Liv Moore-iZombie, Newt Scamander-Fantastic Beasts and Where to Find Them, Licht von Granzreich-The Royal Tutor, Professor Ozpin-RWBY, Yoshiko Tsushima-Love Live Sunshine, Maki Nishikino-Love Live (Christmas outfit)