flesh and blood; blood relative; kin
Refers to one's own family members, emphasizing a deep, natural bond. Often used in formal or literary contexts.
He appealed to the ties of blood.
Conflicts among one's own flesh and blood are sad.
flesh and bone; body
Literally 'bone and flesh'; used to refer to the physical body, often in a somewhat literary or figurative way.
The hard labor felt like it was wearing down my body.
osteosarcoma
blood feud; domestic discord
to fight among family; to have an internecine feud
Compound of 骨 (bone) and 肉 (flesh). The meaning 'blood relative' is a metaphorical extension from the physical body to one's kin.