Not sure why people find this offensive? It's more of a comedy than anything else. In fact there's been quite a few manga/anime that have been released in 2018/2019 that share many tropes to this.
Page 4 ,They should not have given it to that kid, now she is going to act like an entitled brat. That mom should have refused it, she will have hell to pay later.
Both of Shou's parents are pieces of shit though. The father for cheating and the mother for being a bitch. It's always the kids that suffer the most, its reasons like this why people Japan stop having kids in the first place.