All true, however only in porn games (and obviously I know this is a porn game) does the logic go: 1) meet new people who could be related to you and 2) struggle with your desire to fuck new possibly related people then 3) fuck newly acquired relatives every depraved way you can imagine.
The MC is a world famous photographer with a very lucrative business and groupies (at least one, who now works for him), in theory he is also a rather fit and attractive man. He must be swimming in model/supermodel pussy; nevermind any neighbors, the ladies at the coffee shop, etc. Why would he endanger all of that to chase his daughters? (obviously because that is the point of this porn game)