Bale's proud parents, Frank and Debbie, will be at St Mary's.
Debbie told the Sunday Express: "Southampton prepared Gareth brilliantly. They really cared for his every need and we're very grateful for that.
"We were over the moon when Saints returned to the Premier League, where they deserve to be.
"We always look for their results, and although it was a bad one at West Ham last week it was great to see Adam (Lallana) score his first Premier League goal.
"We all wanted to go to this game so much.
"Gareth bought tickets for 13 of us - his sister Vicky, aunties and uncles and a few of his friends. It's going to be a big day."