Mafia Siblings FF

All them are fierce and scary mafias in under world having a team of bangtan as their father's was mafias as Mr. Min and Mr. Park died during the fight and then Mr. Kim adopted them. As they four were very young so they didn't know about it.
Mrs. Kim died while delivering tae so then he didn't marry again that's what the hyung line thought but some mysteries are hold.
Bts hold a strong bond and believe that
"Relations bound with love and care are stronger than blood relations"
What will happen when seven brothers found out that they have a sister how will it effect the Kim brothers ????