Pls don’t have kids if you are going to be like that in front of your kids

It's not about that at all. His biological mother died and ontop of that his father is a yakuza. I would assume his bio mother was also a house wife but if you think about it, everytime toma cries it's a relief knowing he's still a kid and haven't matured that fast because his bio mother died. Before his "mama" came he rarely smiled and was as dense as Daiki but now he gets to enjoy the feeling of being a kid. And even though he's only a kid, it's clear that he's developing abandonment issues.