Rogue theory/ concept: Not only is the MC the actual father of his cousin Chloe, but he is also Kimberly's father AND he is actually the one who impregnated his mother making himself his own father (& the father of his sister Natalie).
And to take it an even crazier step, there could be a third stage of incidents where he meets his grandmother when she is young and gets her pregnant too so he could also be his own grandfather at the same time, creating multiple levels of incest. We could end up having scenes with the grandmother when she is young as well as her MILF and GILF stages.
With magic and other supernatural elements already present in the story, anything is possible and doesn't really need to be justified with a rational explanation. The dev could get wild with this story....
Now, do I actually think this is going to happen. No, but it would be amusing to say the least.