Actually "your" is the correct word. Your=possesive. You're=you are.But it's just ironic. Plus the clan is based on cats.... so yeah. I understand you don't need to be in a cat group but the way cats are used here and Cats Creed is the only Cat Group.... answer done.
Grammar? I think you need to be on YGS....
Your?
And where is that full-stop?
[I'm sorry if I'm off topic so here:]
#GrammarNaziFail