Sannin Gurashi
Sometimes family stinks. The people who are supposed to be there for you, aren't. But at least, they get their happy ending. I liked the big brother's story more than the little brother's story.
Tadaima, Okaeri
One of the best omegaverses.
Tears Of A Devil
Rather than romance I was getting more of a father son relationship between the two??? So I don't really like the shounen ai tag.
Samishii Hito
Boku Wa Ne
Family manga. I mean some shounen-ai if you like squint between the fathers, but they're just really good friends. I feel like the art changed halfway through? It did make me cry because family, but it's...very slice of life. So don't expect drama or action or anything. Something to read if you're looking for mellow familial love.
Hare no Hi (ASADA Nemui)
hm. this is a first. this was about love, but of the familial kind. a father who was too afraid to open up about his sexuality finds his son in a similar situation, but his son, is able to choose a different path. They're a good example of father and son.
Amaama to Inazuma