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.
After hearing about the accident, I contacted my family first.
I have a doctor in the family, so I will ask for a little advice.
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.
Please keep this matter within our own group for now.
The company was criticized for being lenient toward its own people.
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.
The boss appeared with two of his men.
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.
My whole body trembled with fear.
I took the day off work because there was a death in the family.
He lied in order to protect his own people.
We decided to hold the wedding with just close family.
The matter was settled among ourselves, within the group.
身内 refers to one's own family or close associates, the opposite of 他人 in the sense of an unrelated outsider.