As a noun, can refer to a close relation or someone personally involved — a close person or relative (context-dependent).
保険の手続きは親身の者が代理で行った。
A close person handled the insurance procedures on my behalf.
事故の知らせはまず親身の家族に伝えられた。
The news of the accident was first communicated to close family members.
親身の事情があるため彼は出席できなかった。
He couldn't attend because of personal/close-related circumstances.
Being kind and considerate; taking a sympathetic, personal interest (often used as '親身になる').
先生は親身になって学生の相談に乗ってくれた。
The teacher listened to the student's concerns with sympathy and care.
彼女は親身な対応で評判がいい。
She has a good reputation for her caring attitude.
困っている友人には親身になって手を貸すべきだ。
You should lend a helping hand to friends in need with genuine concern.