Hi,do u want to get at your little sister or maybe even your big sister well i will do a post for big sisters because they are so annoying they wont fit on one post lol.
So you wanna get at your little sister,well are you not the best brother ever then(sarcasm)
Age 3-5: You can tell them jokes that make them laugh so hard they cry.(any joke works)
You can tell them a scary story before they sleep they will probably wet the bed or even run to your parents and want to sleep in their bed.(this one i found works the best)
For more check out my other posts