Searching A Manga Title

I think it was the ke sisters but I'm not sure, is it on mangago?

I honestly don't know the plot of the story. The only thing I know) remember about it is an edit I saw once on YouTube. I searched for the edit but couldn't find it sooo.....

Anyway, the edit was a scene where the fl(a child) caught her brother with her teacher (tutor?) Kissing on the balcony.


The fl and her brother have black hair and I think golden eyes. The teacher, she has a long wavy blue hair.

That's all I could remember but I really wanna know the title so please help me find this

I remember reading a manga a while ago and really want to re-read it. I think the mc was taking care of his sister's child after she died in an accident together with their parents. In the past the mc distanced himself from his parents bc they found out that he's gay and didn't accept it (maybe just the dad didn't accept it). At the end of the manga he returns home to sort out some things and realizes that his dad still cared about him bc he found something that his dad had collected or kept about him.

Thanks for the help :)