Wedge Antilles is Obi Wan's uncle!
Yes, from a certain point of view...
In terms of the film there is no relationship between Wedge and Obi Wan Kenobi however in the real wold Denis Lawson who played Wedge Antilles is the uncle of a rather famous actor called Ewan McGregor ! Dennis's sister is Ewen's mother.
An interesting aside is that Wedge is the only minor character of the original trilogy to survive all three major battles being Yavin, Hoth and Endor.