A more thorough explanation:

Definition: Vertical equality refers to the equal distribution of an estate among the families of children, ensuring that each family receives an equal share.

For example, if a parent has three children and passes away, their estate will be divided equally among the three families, regardless of the number of children each family has. This ensures that each family receives an equal share of the estate, promoting vertical equality.

Vertical equality is different from horizontal equality, which refers to the equal distribution of an estate among siblings, regardless of whether they have their own families or not.

Overall, vertical equality promotes fairness and equal distribution of resources among families, ensuring that each family receives an equal share of an estate.