Jim was 18 years old, attending Fred’s alma mater, Rollins College, and had apparently stopped returning his parents’ calls or writing them. “It’s been painful, and it’s rough on Jamie,” Mister Rogers said, “But if we don’t allow him to go off and have this time for himself, he’ll never come back to the nest.”
Source : https://www.distractify.com/p/did-mister-rogers-have-children