You can say "salve, fili" in Latin to mean "hello son."
Filium is the objective case of the Latin word filius which means "son".
Filius oblitus.
It's Latin for "and of the son".
Filius.
Meus filius
Filius
Of the son; or 'son!' (vocative, direct address).
Accusative singular of 'filius,' meaning 'son.'
filius est
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To say the words Son of God in Latin you say Filius Dei. These words are said in Italian as Figlio di Dio.