My sister had the exact same experience with fraternal twins. She was very vocal about providing gender neutral environment. My children were not twins but bot

My sister had the exact same experience with fraternal twins. She was very vocal about providing gender neutral environment. My children were not twins but both were decidedly birth gender centered. There was a time my daughter asked for tools and matchbox cars which I promptly gave her when she returned from school. She played with them for a week and went back to polly pockets. This is obviously not the case for everyone. However, from experience it is biologically driven.