This list might helps, hope you find what you are looking for, feel free to follow and recommend, have a nice day
http://www.mangago.me/home/mangalist/784543/
http://www.mangago.me/read-manga/bokura_no_shokutaku/
http://www.mangago.me/read-manga/kazoku_ni_narouyo/
(you can choose to read the prequel first: http://www.mangago.me/read-manga/itsuka_koi_ni_naru_made/)

Hey does anyone have a manga or manha anythinh that is kinda like a single dad or big brother taking of siblings or child that's wholesome