My theory: cosmo can't SEE his sibling(GINGER) just in christmas so that's the problem. They are in a room (the christmas toons) until there wasn't any food source SO ginger offered herself... Sad theory 7n7
Mine:sprout thought cosmo was cheating on sprout (this was before sprout knew about ginger), so sprout bit ginger but then cosmo told him that they're related-