This idiom is eight words.

Descendants of the ancient philosophers, generations of descendants, prosperous people, predecessors planting trees, descendants enjoying the cool, descendants of the ancient philosophers, this branch is immortal, prosperous people, and melons are endless;

A hundred children and a thousand grandchildren: there are many descendants in later generations, which means that people live long and prosper;

Full house of children and grandchildren means: it means many children and grandchildren;

This branch is immortal: it refers to the prosperity of children and grandchildren, and it will last for a hundred generations;

Prosperous population: describes a large number of descendants.