@wonder2wonder said:

I don't know if this is a sequel to the original 1961 episode or the one in The Twilight Zone: The Movie (1983). In this episode Anthony is now 46 years old. He has a daughter. Nothing is known of his wife.

The ending was expected, but still I had hoped for something else.

I would say it's a sequel to the original since Billy Mumy is the dad in this one and he was the original Anthony.