What's the difference between them, they are and there? I think very similar !!
"Their" is a possessive form of "they". He -> his; she -> her; they -> their.
Example: "This is their car."
"They're" is a contraction of "they are".
Example: "They're going to school."
"There" is an adverb to talk about a place that's far from the speaker. It's the opposite of "here".
Example: "I moved to the United States and lived there for five years."
"There" can also be used as a pronoun to introduce the subject of a sentence.
Example: "There's a loud noise outside."
Their is a possessive pronoun.
"This is their house" = They own the house.
There is a locatiive adverb, and describes a location.
"He is standing over there." = He is standing somewhere different to where the speaker is.
They're are is a contraction of the pronoun they and the verb conjunction are.
"They're sitting on the wall." = They are sitting on the wall.