Who is Mortimer Schwartz from Welcome to the Monkey House and what is their importance?

Morty is one of the younger members of the Schwartz family. He is a newlywed,and very much resents the type of life he is forced to lead. He dilutes Gramps' anti-gerasone, in the hopes that Gramps will then be able to die a natural death and leave the apartment to him. When Gramps disappears and leaves the apartment to everyone equally, Morty fights Willy for claim to the private bedroom on the grounds that he just got married and should be on his honeymoon.