1. the fact of being or of being designated the child of a particular parent or parents: "relationships based on ties of filiation as opposed to marriage"
▪ the manner in which a thing is related to another from which it is derived or descended in some respect: "the filiation of Old Norse manuscripts"
▪ a branch of a society or language.
Word Originlate Middle English: from French, from ecclesiastical and medieval Latin filiatio(n-), from Latin filius ‘son’, filia ‘daughter’.
Filiation is the legal term for the recognized legal status of the relationship between family members, or more specifically the legal relationship between parent and child. As described by the Government of Quebec: Wikipedia