HELP PLS

There is this one omegaverse manga that i used to like but i basically forgot most of the plot points except the ending when the couple have two kids (an alpha boy and omega daughter), and the parents traditional family take the omega daughter back to their hourse and when the brother tries to go save his sister he sees another trapped omega there and falls in love with him. They meet years later when the fams traditional -ness has fallen apart and then actually fall in love