Andrew Kim was the son of Linnis Paris and Harry Kim in the future Kes experienced in Before and After.
Andrew Kim was the grandson of Kes and Tom Paris in a possible future timeline. His mother was their daughter Linnis, and his father was Harry Kim, making him part of the extended family that grew aboard Voyager.
In Before and After, Andrew was among the relatives gathered around an elderly Kes in sickbay as the Doctor prepared to try a treatment to extend her life. When Kes began slipping backward through time, she met him and the others as strangers, and their presence helped her understand the life she had not yet lived.