"hows the dads personality change so much" presumably its been like 20+ years, and also shes an adult now instead of a 5 year old. it's not that surprising
a lot of people upset she would kiss without saying her gender but at the end of the day, she fell in love with her. she's not putting on an act or lying any further than not clarifying her gender.
the author is really undercutting the tragic backstory involving abuse with their poorly thought out "comedy". anyways they are gay and that's pretty great