This might be a long shot but there is a older guy I do side work for and I've seen his family a lot and of course his daughter

One is 21. She acts kind of mature. Not sure if she is shy/dull angry or whatever you call it but she has that sort of "never amused/very reserved" attitude I guess you could say.

I showed up at at a BBQ after going to their house and asking for her dad and I guess she showed up after I got there and said "hey you made it". No idea if she came because of me or not.

I have no real long term game (I'm a hook-up/fwb guy) and obviously I'm not gonna mack on her in front of her parents (basically only time I see her). I don't know what to say to her to engage conversation without being creeper status.

One time I showed up and she was in the garage helping her dad (well sitting in the chair more like) and I started helping him and noticed her looking the other way and then leaving us to go inside...not sure if that means anything. She almost never looks at me but has made jokes about her dogs not liking my appearance.

She's 21, I'm 30.

Long shot, but looking for any advice on this.

It's weird but I got this idea of how cool it would be to show up together with our baby in one of those handheld things to a BBQ or something...lol...she doesn't seem slutty at all. Kinda dorky but cool and sexy.

I rarely meet decent women and especially ones I would date or marry or have kids with.