The father did try to build relationship with the MC, he was totally on the MC side and doted her in his own way, the eldest brother is stupid and there's no mention or appearance at all about the second brother expect at the early chapters
Hm... let me clarify some things...
Yes, the father regretted and is trying to build a relationship with her. She accepted it because he clarified that at her ceremony he was not mad not disappointed in her... he was mad at a priest that was badmouthing her and he left her there to go deal with him out of anger. Also... she understood that he was heavily depressed and kinda addicted to the alcohol and visions of her mother... so she didn't blame him as much.
The second brother lived more with the knights than at home and was mostly unaware of her situation but doesn't like the twins and usually takes her side... he is also making an effort to build an even better relationship with her... and she does accept him... she pokes fun at him and makes him do all sort of things for her as vompensation too... a very sibling like relationship...
The older brother... is slowly regretting or regretting a little ant trying to better their relationship... but mc ain't having it... she accepts him as family but doesn't let him close.
There'll be a point where they regret everything even more... but it's spoiler so I'll keep it...
Have the father and brothers regretted after chapter 30?