someone's (own) flesh and blood

US /ˈsʌm.wʌnz oʊn flɛʃ ænd blʌd/
UK /ˈsʌm.wʌnz oʊn flɛʃ ænd blʌd/
"someone's (own) flesh and blood" picture
1.

a person's close relatives, especially their children

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How could you treat your own flesh and blood like that?
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She would do anything for her flesh and blood.
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flesh and bloodbe in someone's bloodfleshbe after someone's bloodsomeone's blood is upbloodmake someone's blood boil