Who is Mrs. Leonard from Welcome to the Monkey House and what is their importance?

Mrs. Leonard is Paul's mother. She is very nervous about leaving Paul home alone but also doesn't want to take him along, as the movie "isn't for children." As she and Mr. Leonard leave, she tries his patience by asking Paul question after question about what he's going to do while they're gone, whether he can dial the phone, etc. When the Leonards return after the movie, she is very happy to be home with her son and very proud that he is alright. She notices the worn spots in his clothes and identifies the scent coming from the handkerchief in his pocket as "Tabu," a perfume.