Hazel

I've got a question about the cast of "Hazel". In the storyline of the show, George and Dorothy Baxter leave the country on business. They cannot take Harold with them, I assume for school; so Harold and Hazel go to live with George's brother and his family.

My question is in reality, why did Don DeFore and Whitney Blake leave the show? Was ther some sort of salary dispute? Did they leave when the show changed networks?

Shirley Booth is a great character actress. Who can forget her memorable performances. She and her husband were involved in "Duffy's Tavern".