Okay, so far this is pure speculation.
Another point: John is heavily tattooed (we haven't seen him shirtless yet). But when he has that distinctive tattoo on his back... Iris and Erynn look similar...
		
		
	 
	
		
	
	
		
		
			Nah, Mr Monroe is absolutely loaded, while Mr Navarro is well-off, but not rich rich. Plus, this is the bar Alexis works in, surely the other bartender would've mentioned that to the MC.
My bet is that Adriana's husband is Zo, since he's the only celebrity we've been introduced to.
		
		
	 
Mr Navarro aka the sports agent, is/was married to Gabi the Spanish teacher, and 
is the odds on favorite to be the MCs dad.
He's also the guy from the bar and he was friends with Zo(retired basketball player) back in college.
Mr Monroe, father to Alexis and Layla, famous and easily recognizable, rich and a retired sportsperson, everything seems to match with Zo indeed.
John just fits the description Melissa gives to the father of Erynn perfectly, tall, blonde and tattoed, no one else in the story matches this description.
Plus the game keeps hammering how much Erynn and Iris look and act like each other.