noun
relatives; family members; one's own family
Refers to people close to oneself by blood or family ties. Often used when distinguishing family from outsiders.
事故の知らせを聞いて、まず身内に連絡した。
After hearing about the accident, I contacted my family first.
身内に
I have a doctor in the family, so I will ask for a little advice.
noun
one's own people; insiders; close associates
Extends from family to people on one's side: friends, colleagues, or members of the same group or organization. Can contrast with outsiders or the public.
この件はまだ身内だけの話にしておいてください。
Please keep this matter within our own group for now.
その会社は身内に甘いと批判された。
The company was criticized for being lenient toward its own people.
noun
followers; underlings; henchmen
A more factional or underworld-flavored use for a leader's own men or followers; the English 'henchmen' is context-dependent and often negative.
親分は身内の者を二人連れて現れた。
The boss appeared with two of his men.
noun
Refers to the body as a whole, especially in descriptions of physical sensation or reaction. This use is less central than the family/insider meanings.
恐怖で身内が震えた。
My whole body trembled with fear.