Character-driven domestic storylines combined with high-end 3D graphics.
Also, considering the part number, Part 4 might escalate the conflict. Common narrative structures in series include setup, complications, climax, resolution. Part 4 could be the climax or beginning of the resolution. Perhaps the deep story explores how the family faces their ultimate challenge. Y3df Meet The Johnsons Part 4
While your query likely refers to the Y3df animation, the "Johnsons" title is common in other media: The Strange Thing About the Johnsons considering the part number