Alright, now my issue is that I don't remember too much about this manga.
What I do remember:
There is either a guardian or an adoptive father who takes on an entire house hold. I believe he is blonde and I'm not sure about the others...
Now, he doesn't feel like he is part of the family, or he feels as if he betrayed the family for some reason... I don't remember but at a certain point this guardian or something runs off, and the family that consists of multiple ages comes after him and says that he is definitely part of their family, he cries, or something and feels better, but the eldest (I think) and him end up falling in love (maybe that's why he felt like he betrayed them?)
I think it was a semi-long manga, and I remember it was one I absolutely loved...
Now this isn't much to go off of, but I truly hope someone can find it for me...

Thank you in advance...

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Kyou-kun~

Kinda similar, Home Drama? Series is only one volume long.

The Mainichi Seiten! series?

It reminds me of Brother x Brother but there's a few plot details that are different...

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"The great man is he who in the midst of the crowd keeps with perfect sweetness the independence of solitude." - from Self-Reliance by Ralph Waldo Emerson

Thank you so much It was the Mainichi Seiten! series after all. I always enjoyed this story, though it's not my favourite art style. Thank you very much!

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Kyou-kun~