Is it normal that i wanna have a threesome with my brother and dad

I was talking to my dad one day, when his phone lit up with a notification from his sex buddy(meaning he was cheating on my mum but who am I to judge ...I wanna fuck him too). But he quickly covered his phone and said
" just the TD bank doing its thing"
From then on I just really wanna fuck him. My brother on the other hand, was jerking off next door ( the bathroom) and I started to cringe a bit but after hearing him multiple times, it sounds like a lot of fun and now all I wanna do is to fuck them.
Is this normal?