The FL is a poor girl and she marries ML to help her family(lil brothers n sisters ). The second ML tries to be with her but she’s his long lost sister. It was a fire accident and they were rich. It was in historical setting and had good art.
I think you’re talking about stepping on roses https://www.mangago.me/read-manga/hadashi_de_bara_wo_fume/
https://www.mangago.me/read-manga/chibi_demo_ii_yo/uu/chibi_demo_ii_yo-chapter-5.5/20/
Which manga is this?
It's from this manga -
https://www.mangago.me/read-manga/hinadori_wa_shiokaze_ni_madoromu/