I'll comment how the 21 joke started.

(These are made up names.) 1 brother called the other one dumb. His name was Chase. The second brother (A.K.A Chris) Said "I'm dumb? The what's 9+10? Chase answered "21" Then Chris proved that Chase was the dumb one. You're welcome :)

@❄️ICE_QUEEN❄️ actually I thought 9+10 was 19, but it's actually 21..

@🎀🌷ƖąɖყƖıƙɛ-Ɩąųཞą🌷🎀 😑😑😑