Pósa was the son of Izsép Bárkalán but his mother is unknown. The date and place of his birth have not been found.
His wife is not known. They were married, but the date and place have not been found. Their six known children were László (?-?), János (?-?), Balázs (?-?), Margit (?-?), István (?-?) and Miklós (?-?).
| Attribute | Date | Description | Details | Source | Multimedia | Notes |
|---|---|---|---|---|---|---|
| Nobility Title | Krassói főispán |