Definition
Affecting people close to, or within, one's family circle.
How People Actually Use It
1.) Figurative: A metaphorical phrase for that which affects a person directly, or is of personal concern to him or her. 2.) Literal: Within close proximity to a person's home or dwelling.
"Drunk Driving is a subject that hits close to home with members of MADD. The bombs hit close to home last night; they were only a few miles away."
Source: Urban Dictionary