honorific prefix; polite prefix; humble prefix
Usually attached before Sino-Japanese words with on-yomi readings, such as ご家族, ご連絡, and ご注文. It can show respect for someone else's things or actions, make speech polite, or appear in humble expressions for the speaker's own action, as in ご説明します.
See also: お
ご家族はお元気ですか。
How is your family?
明日、こちらからご連絡します。
We will contact you tomorrow.
ご注文を確認いたしました。
We have confirmed your order.
honorific suffix for a person
Attached after a noun referring to a person to make a respectful term. In modern use it is limited and is especially familiar in words such as 親御さん for someone else's parent or guardian.
生徒の親御さんから電話がありました。
A student's parent called.
親御さんの同意が必要です。
The parent or guardian's consent is required.
Please check this document.
I will get in touch with you later.
Could you tell me your address?