The first time I spent any extended amount of time with my gf's dad was when he took us to a Tampa Bay Rays game. My gf and I had only been dating for about 9 months. I was not a huge baseball fan at the time, but my gf grew up attending many Ray's games with her dad. So this was a sort of rite of passage. We attended the game against the Boston Red Sox, a team that my gf grew up hating. It was nice to see the Rays win the game. It was even better to spend some quality time with my gf's father and really get to know him better.