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

1.
亲骨肉, 至亲
a person's close relatives, especially their children
:
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How could you treat your own flesh and blood like that?
你怎么能那样对待你的亲骨肉?
•
She would do anything for her flesh and blood.
她会为她的亲骨肉做任何事。