HIS, HER or ITS ?

1
This is Di Hunter, parents are from London. If I remember well, father is a doctor and mother is a nurse.
5
Boxer is a famous dog. Everybody knows name because TV commercials are very funny!
3
Tim Fox is a very happy writer because job is exciting. Lerry likes sense of humour.
2
This is Jerry, second name is Lee. Jerry likes co-star, Di Hunter.
4
Marsha Gates loves job but she is very strict with actors and technicians.