People belonging to one's own side, social circle, or family; those who are considered 'one of us' rather than outsiders.

to hurt oneself by one's own actions or have one's own plot result in one's own undoing; to be hoisted by one's own petard

to exercise power arbitrarily (idiom)

to hurt oneself by one's own actions; to shoot oneself in the foot

to perform a task or do work by oneself instead of relying on others

Help others, and others may help you.

there's no place like home

to be oneself

(coll.) (Tw) to be dismissed from one's job; to get sacked