The Welsh side clinched a 16-6 victory over the French outfit on Saturday courtesy of a match-winning try from North.
After North slammed the ball over the line, his father David stormed the field to try to celebrate with his son before being led away by stewards.
"It was a freezing night and we were sat in that corner, right in front of where George caught the ball," David told the Daily Mail. "I was just so happy and overwhelmed watching him score.
"It was such an important game for the team and I know first hand how hard they have been working to get that victory.
"Before I knew it, I was on the pitch. Thinking back, I know it was a silly thing to do but I just got caught up in the excitement of it all."
North's try was the 12th of his international career.