Gender question.

So my fiancé has a daughter from a previous relationship and I have a son. We’re both really hoping for a girl but he’s positive it will be a boy. He says this because “almost every man in my family has never had 2 girls back to back” so he thinks because of that it will be a boy. What do y’all think? I still think because he’s already had a daughter there’s a good chance it’s a girl. :) 💗💙