My new step mom is younger than me

My parents got divorced 2 years ago, my dad got a lot of money in the settlement. My mom made a lot of mistakes in the process, she got a really bad lawyer and spent a lot of money on him, in the end she was left with a tiny bit of money and a very small house. My dad got to keep our huge house. <br><br>My dad met this new woman, she is 19 years younger than him, but still older than me. She's nice, but she seems very shallow, All she cares about is clothes and makeup. She is really pretty and my dad loves her a lot, and he's really happy, so I'm happy too. They are planning to marry in May. My step mom is planning on using her money to pay for the wedding, but she's spent a lot and she might run out of money before the wedding. My dad has offered to pay for it but she doesn't want to, she wants to pay for it by herself. After they marry, my dad is planning on buying a new house in another state, my step mom isn't too happy about it but she won't say no. <br><br>I'm not sure what to do when they get married, I'm an adult so obviously I don't live with my dad anymore, but part of me feels like I should live with my mom, after all, she is my mother, but I also feel bad for my step mom, she's going to marry my dad and move to a different state, she will be alone. She also seems a bit scared, she seems to be trying very hard to make a good impression on me and my siblings, so obviously she is worried about us not liking her. I don't know what to do, I don't want to hurt anyone.