Is it grammatically correct to add a full sentence after the word either and the word or as in the following sentence, or should it be written as in the second sentence?
My brother is a cook and works in a pizza restaurant. However, I have never seen either he is cooking a meal or ( making) a pizza at home.
My brother is a cook and works in a pizza restaurant. However, I have never seen either his cooking a meal or (making) a pizza at home.