Adjective derived from "descendant"?

"Ancestral" means "of or pertaining to an ancestor or ancestors". Is there an adjective which means "of or pertaining to a descendant or descendants"?

"Filial" isn't quite the right word, as it suggests only a single generation's remove.

Descendent (adj.) is the term you are looking for:

• Proceeding by descent from an ancestor.(AHD)
• (Anthropology & Ethnology) deriving by descent, as from an ancestor. (Collins)

From Doing Business in Europe:

a relative in the ascendent or the descendent line of such a person; person who is related by marriage to such a person in the ascendent or the descendent line...

The variant descendant is also used.