For me

Being a big sister is so satisfying. Spoiling(not material)your younger sibling is fun...Teasing and making fun of your younger sibling is fun...Nagging at your younger sibling is fun...Disciplining your younger sibling is fun.

Its so satisfying especially when you can see the good effects and how they understand things in life and how you see them grow and turn into a better person despite the missing puzzle peice of his life. All i can say is...'hindi kami nag kulang. I'm a good sister after all' The responsibility of a big sister and a brother is not easy. You are the role model,  so be cautious in your actions.