Hey there EvaLiza, thanks for reaching out. We see you are inquiring on how to let your sister play the games you own. Luckily, there is a way to share access of the games you have with another device! To find out more about Multi user accounts, app sharing, and how to enable them, please click here. Please note: this is not a guide to "giving" the games to your sister as there is no current way to transfer games on one account to a different account. Hope this helps.
Please let us know if you still have any more questions or require further assistance relating to app sharing and using multi user accounts!