I accidently kissed my sister.....?

We were playing around and we could not take it anymore and we kissed. I am so scared because I don't know if I should go further! I am 16 and my sister is 12. But my 12 year old sister also has a crush on my 32 year old mom. Please help! Iz it just my sister who is gross, or are we all gross. I think my my does it because she does not like our sugar-daddy he pimp slapped her once.