Bro you cant always make up some strange theories and follow up later on with "if theories are true" as if some majority would believe these (paritally) outlandish takes.If theories are true it's more likely to be Carla's dad, since theories are going that Gina is Carla's sister considering how much they look like eachother.
Other than it, imo it's also likely that he's Rusty's dad, simply looking at the color of their hair.
This is getting close to dalli levels