Do you mean 'Super Lovers' ?
No, they are not related at all, like they were step brother. The father have 3 sons and the mother have 1 son. They became family but their mother and father died in accident
And I don't know why I was downvoted is it controversial?
people are just evil
I hope you find what you’re searching for
Might have been this one? Not sure. The mother is the one with the three sons and the parents pass away under different circumstances. But it's the most similar BL to your premise that I know of.
https://www.mangago.zone/read-manga/bokura_no_negai/
Yeah, this one! I was wrong, the father had only son while the mother had 3 sons. And it's not the eldest son and the only son, but the middle child and the only son.
Thank you for this!
No problem. I'm glad I had the right one. Enjoy your read!
BL consist of 3 or 4 brothers? Father remarried with single mother with a son. They both had accident and died. The only son and the eldest brother fall in love with each other. I don't know if I'm remembering things correctly but just like this. Anyone?