The 1st & 2nd story just decent enough.. But the 3rd one is simply weird..

Well, the third one was also pretty good, although maybe you just have different preference. It's just weird that he started falling for the son like, right after she died.

He might've loved his son because in the manga it specifically said that the mother and son both looked alike, so the father was attracted to someone who looked like his wife. Then Tsukasa noticed more of Naomi instead of Nahomi, since Naomi was growing up to be VERY handsome, if I may say so ;3