Grandma Shumway
"My Grandma Shumway once said: "if you can't say anything nice, don't say anything at all"... And then she never spoke to me again"

Grandma Shumway was ALF's grandmother. After advising him to only speak when he had something nice to say, she never spoke to him again...

She also warned of Melmacs' impending destruction, but was committed; where she stayed until the planet blew-up.