well I'm sure they've all heard of it, I mean my mom got me a poster of pokemon, my younger brother drew me some pokemon, my youngest brother collected and played the trading card game with me, and my older brother owned/played pokemon black when we both got it years ago (if I'm right I think we got them both on my birthday) and I don't think my dad has any experience with pokemon, just that I've talked about it with him and he refused to watch the detective pikachu movie because he said it was for babies
despite all that, I'm the only one that will consistentally talk, and think about pokemon.