Without the incest path it's simply just weird :/
In the photography we see during the introduction, why the girl next to the person you called dad all over, is the wife of your landlord ?
Why should the said landlord's wife reject you because she became pregnant at a very you age ?
Why should the disappearance of your dad (it's how he's called in the dialog) would change anything to the life of your landlord's wife ?
Why your dad ask to the landlord's wife to take care of you if something happen to him ?
Why your landlord's wife say that she love your dad ? And why your dad say it back, calling her "sweetie" ?
Why are you living in the same place than you landlord's wife 15 years later ?
Why your landlord's wife was harmed by the death of your father ?
Where the fuck is your landlord ? You always see his wife, but apparently himself don't live with you too.
And replacing "dad" by landlord would change nothing. Why should a 6/7 years old boy live with his landlord and his wife ? Why should he even have a landlord ?
What if, for once, we simply don't want to play an incest game, but still want a story that make a little sense ?