The Moomins (1978)
S1E38 Good Morning
The day after the volcano erupts, the Moomin family decides to enjoy a lighthearted picnic in their attic. However, as the water levels rise, they find themselves needing to abandon the Moomin House. Soon, they come across a peculiar house drifting nearby, which they choose as their new shelter. Thus, begins their thrilling adventure into uncharted territory.