A parentelic system is a method of identifying heirs by tracing bloodlines through “lines of parentage” (parentelae), rather than by fixed degrees of kinship alone. In succession law, it ranks relatives by family branch: typically starting with the deceased’s descendants (first parentela), then parents and their descendants (second), then grandparents and their descendants (third), and so on.In the UK and Ireland, the concept underpins the statutory rules on intestate succession, although “parentelic” itself is usually a descriptive term rather than a defined statutory expression. The approach is broadly consistent across England and Wales, Scotland, Northern Ireland and Ireland: closer parentelae exclude remoter ones, so that more distant relatives on a nearer parental line inherit ahead of closer relatives on a remoter line.Practically, understanding the parentelic system is important when advising on intestacy, drafting wills with substitutional gifts, resolving conflicts between different branches of the family, and interpreting succession legislation. It assists in determining entitlement where there are no surviving spouses, civil partners or direct descendants, and in explaining to clients why certain collateral relatives (such as cousins) may or may not inherit.