deference between their and there

Yes,.. Their are sons (here's their is plural ) There is my cat. (here's there means indicating a place)

Their = Belong to a person. Example : She is their Sister There = It is used to tell the located thing (s) . Example : There is a cat. These are homophones. Example : There is their sister.

"Their" is the possessive form of "they" which means something or someone is belonging to such person or such thing. ex..it is their house. "There" means "at that place" ex..there is a cat.