Filius

Latin term for "son." The term may appear spelled several different ways in historical documents according to its grammatical usage in the sentence, as shown in the following table:

Case	Singular	Plural
Nominative	filius	filii
Vocative	filie	filii
Accusative	filium	filios
Genitive	filii	filiorum
Dative	filio	filiis
Ablative	filio	filiis