I am a ten year old boy and my thirteen year old sister will not bath with me anymore, how can I get her to?

It’s completely normal for siblings to want their privacy and to grow out of certain activities, like bathing together, especially as they get older. Your sister may need some personal space as she matures, and it's important to respect that. Instead of trying to get her to bathe with you again, consider finding other fun things to do together that you both enjoy. You could play games, watch movies, or do crafts. That way, you can still have fun and spend time together without forcing her into something she’s not comfortable with.