I don’t remember much about this cartoon in color. I’m not sure if it’s even a movie or an episode.

All I remember is that it was kinda like an Addams family thing considering kids living with parents (the father looking a bit grotesque but good-natured all the way) and they were like an odd wealthy aristocratic clan who delight in the macabre living in a creepy place and are seemingly unaware or unconcerned that other people find them bizarre or frightening, I think.

Anw, from what I remember, a group of kids were out somewhere with their pet monster-like dog with probably 3 eyes and no ears looking for something to create an antidote to reverse the age regression of 2 girls (possibly sisters) having been turned into babies earlier while the babies are being temporarily cared and looked after by their parents probably (one of them being the grotesque father mentioned earlier).

Once they find the antidote, they administer it to the babies. One of the kids gives the first bottle of antidote to one of the babies as she grows bigger and heavier in his arms while the grotesque father gives the second bottle to the other one growing back too.

Then, the 2 girls start arguing again like before until their grotesque father “tsk-tsks” them and tries to appease them. Later on, everybody celebrates with a feast and orgy outside as the clip comes to an end.

Note: This is NOT the Addams Family, Scooby-Doo, Casper, or Darkwing Duck either.