 Meanwhile, Grandpa-Grumble becomes obsessed with both fishing in a nearby stream that he insists is actually a brook as well as with meeting the Ancestor, a three-hundred-year-old Moomin who he is told by Mymble hibernates in the stove.After becoming terrified that there are insects in the house, Fillyjonk locks herself in the kitchen and, in an attempt to be more like Moominmamma and therefore liked by the others, cooks for them and tries to look after the motherless Toft, who is enlisted by the Hemulen into helping build a treehouse for Moominpappa, whom he is increasingly admiring.Grandpa-Grumble gets a stomach ache and refuses to take his medicines till the others throw him and the Ancestor a party.