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This sounds SUPER familiar... I think I saw one of these around 2000.
Ugh right? I've been looking for a long time, but with no luck. I had to be about 4-8 years old so maybe it was released around, or was semi-popular around 2000?
I found it! It's the Timeless Tales series published by Hallmark. They're all on You Tube. I can't find Jack Frost, but I'm pretty sure this is where you remember the kids going into the attic from. The only one I ever remember seeing is the Ugly Duckling episode; my grandma probably picked it up at a garage scale. Just a warning, some of the episodes have two intros - one with the kids going into the attic, and one at the very beginning of the tape featuring Olivia Newton-John (!).
Edited by Chev
I've been trying for a while to remember this dang show, but with no success. It was on VHS and had a brother and a sister that ventured up in to their (grandparents?) attic. Up there they discovered a talking stuffed animal (a rabbit I believe) that would show them cartoons (I remember one being the 1930s Jack Frost) and teach them life lessons. There were also sock puppets. A barbershop quartet and some female singing and dancing ones. I was born in '92 but my grandmother owned these so I'm not too sure what time they were actually released.