family quarrel; feud among blood relatives
Idiomatic expression referring to a serious dispute or conflict within a family, emphasizing the bitterness of fighting one's own flesh and blood.
A family quarrel broke out over the inheritance.
That feud between the brothers has been going on for years.
Composed of 血肉 (flesh and blood) and 争い (quarrel), literally 'a quarrel of flesh and blood', figuratively a conflict among blood relatives.