D. S. P.

If your relative died sine prole, it means they did without descendants or issue. Sometimes genealogical publications abbreviate this as d.s.p. The person should still be researched.

Note if it is indicated that your direct line ancestor d. s. p., then you’ve got some more research to do. If they actually had no descendants that means they are not your direct line ancestor.

Try a Genealogy Search on GenealogyBank.