In the "Turkey in the Straw" two-parter, ALF befriends a homeless man named Flakey Pete. When the family finds out, they rush to make sure he's okay and then reprimand him about letting his guard down around him.
ALF: Oh lighten up, Willie. It's Fapiano. Besides, aren't you always telling me that under the skin—or in my case, fur, or in Pete's case, a ratty overcoat—we're all pretty much the same: a little needy, a little insecure, but decent and good?
Willie: (to Pete) Listen, ALF is stranded here. He doesn't have any place else to go. I know he looks like an alien to you, but he's a member of our family. We've gotta protect him. We can't let anything happen to him. Do you understand?
Pete: Yeah. I do.