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In some religions, such as the Jewish religion or Christianity, God is called Father. In the Christian belief God is three Persons; Father, Son and the Holy Spirit. Father can also be used as a title for a Catholic priest.
If a man and a woman get married, then in many Western countries, the woman and their children will use the man's last name. For example, if the woman is called Sasha Dooley and the man is called Ben Allen from birth, and they get married, then she will become Sasha Allen and the man will still be Ben Allen. They might have children named John Allen and Mary Allen.