Duhaime's Law Dictionary Descendant Definition: Those person who are born of, or from children of, another are called that person’s descendants. Related Terms: Lineal Descendant, Issue, Consanguinity Those person who are born of, or from children of, another are called that person’s descendants. Grandchildren are descendants of their grandfather as children are descendants of their natural parents. The law also distinguishes between collateral descendants and lineal descendants. Always looking up definitions? Save time with our search provider (modern browsers only) If you find an error or omission in Duhaime's Law Dictionary, or if you have suggestion for a legal term, we'd love to hear from you!