Honorific term for one's own or someone else's father. More formal and respectful than お父さん.
See also: お父さん
Where is your father?
お父様によろしくお伝えください。
Please give my regards to your father.
Please give my regards to your father.
Is your father doing well?
He really resembles his father, doesn't he?
お父様 is a very formal, honorific way to refer to someone's father, whereas パパさん is casual and used affectionately within the family.