Possessive Structure with 的
S + 是 + O + 的 + NUse 的 to indicate possession or a relationship between two nouns. Structure: Subject + 是 + Owner + 的 + Noun. This structure is often used to emphasize who owns what.
这是我家的桌子。
This is my family's table.
他是我的朋友。
He is my friend.