that kinda ruins it a bit. I thought he had to deal with a crazy daughter, but its pretty obvious now, that once marries, they're gonna screw him over. There is no happy ending that invovles him staying with them so BEST CASE SCENARIO.... he ends up alone by the end of the manga.
MC's sister was found to be pregnant(?) by his stepdaughter even tho they never even talked about it and in this chapter the mother and daughter had such strange conversation.. why in a hurry?