What tattoo should I get?

My names Kaitlyn and I want to get a tattoo representing my brother and my sister. My brother just recently got one of me and my sister's initials and birthday on his chest also involving a heart and what not. I loved it and I really want to get one myself. My brother is enlisted in the navy and my little sister is 6 years old. I grew up with my brother and we were always very close even though we fought alot. Our parents divorced young and we took care of each other and raised each other since. He's my other half. My sister is actually our half sister. We share the same father. We didn't grow up with her but we love her more than life. NOW, that you know the details I'd love if any one could give me some ideas on what would look good. Not too big. But still meaningful and symbolic. Thanks so much.