Lineal Descendant Definition: A person who is a direct descendant such as a child to his or her natural parent. Related Terms: Collateral Descendant, Next of Kin Synonymous with next of kin.In Co-operative Trust Co., Justice Dielschneider of the Court of Queen's Bench for Saskatchewan wrote:"Lineage is a fact. A lineal descendant is a kin, i.e., a blood relative. Lineage deals with one's roots."Distinguished from a collateral descendant.References:Co-Operative Trust Co. of Canada v. Saskatchewan [1984] 1 WWR 47. Aka Re Kowbel and published at 16 ETR 142 Categories & Topics: Trusts, Wills, Estates and Probate Law Dictionary Find you are constantly looking up definitions? Try our search provider (works in most modern browsers) If you find an error or omission in Duhaime's Legal Dictionary, or if you have legal term suggestion, we'd love to hear from you!