someone's (own) flesh and blood
US /ˈsʌm.wʌnz oʊn flɛʃ ænd blʌd/
UK /ˈsʌm.wʌnz oʊn flɛʃ ænd blʌd/

1.
親骨肉, 至親
a person's close relatives, especially their children
:
•
How could you treat your own flesh and blood like that?
你怎麼能那樣對待你的親骨肉?
•
She would do anything for her flesh and blood.
她會為她的親骨肉做任何事。