any CUTE as hell manga like https://www.mangago.zone/read-manga/bokura_no_shokutaku/ that has this found family trope , single parent/older bro that falls in love... ???
ooo I love this trope and that's one of my fave stories!!
These are a few others I love:
https://www.mangago.zone/read-manga/our_sunny_days/
https://www.mangago.zone/read-manga/kazoku_ni_narouyo/
https://www.mangago.zone/read-manga/one_week_family/
https://www.mangago.zone/read-manga/everyday_is_a_good_day/
https://www.mangago.zone/read-manga/hinadori_wa_shiokaze_ni_madoromu/
This one is less fluffy but still nails the found family trope:
https://www.mangago.zone/read-manga/daraku_kazoku_ron/
If you've read all these, you can browse my list which has more of the single parent/found family dynamic: https://www.mangago.zone/home/mangalist/1008397/
any "Harada/Asumiko Nakamura like" bl ??? kinda twisted, maybe happy ending maybe not, nice drawing style...
https://www.mangago.zone/read-manga/sheep_s_mask/
https://www.mangago.zone/read-manga/boys_of_the_dead/
https://www.mangago.zone/read-manga/hardcore_bl_anthology_the_tosa_s_master/