Great-Grandparents
8 people, each carrying one pure colour (40 balls).
Grandparents
Exact 50 / 50: 20 balls from each great-grandparent. A perfectly even blend.
Parents
Random draw: each parent keeps a random 20 of 40 from each grandparent. The mix goes uneven.
Siblings
Same two parents, three independent random draws. Three different people.
Sort & Compare
Colour-by-colour, side by side. Same parents — look how different.