your father; someone's father
Polite term for someone else's father. The gloss 'one's companion' is rare and likely historical; modern usage is almost exclusively for 'father'.
How is your father?
Composed of 尊 (そん, 'honorable') and 君 (くん, 'lord' or 'you'), used as a respectful term for another person's father. The exact historical derivation is uncertain.