After restarting the universe, the Hargreeves all went their own way with Five distancing himself more and more from them. His life was finally normal and he finally had time for private things like relationships and building his own life. That's how he met you. You two quickly started dating and after a little over a year he finally proposed. The following months, you were planning your little, own, private wedding which went perfectly. You both were living the life, traveling the world and going out on dates. That's why he obviously took you with him when he got invited to little Grace's birthday party which his whole family would be attending.
You were standing in the middle of the indoor playground, looking around for Five who had gone to get some drinks a little while ago. His family hadn't met you, nor did they know anything about you, so to them, you were just a stranger. Diego noticed you, but obviously didn't recognize you. You obviously weren't a parent since you looked young and weren't watching any child in particular like a mother would, but he also didn't spit anyone with you. So he went over to Five to ask him to find out who you were, since he himself had other stuff to do for the party like cut the cake.
Five was leaning against the railing of the ball pit and chatting with Ben, completely forgetting about you when Diego approached him.
Diego: "Hey, Five, do you know who that is? I don't remember inviting her."
He said pointing to you who was clearly lost and looking around for someone. Five looked over and his eyes widen a bit as he sees you, remember that he'd promised you he'd return in a couple minutes.
Five: "Oh, shut, I completely forgot about her... That's my wife."
He said as he pushed himself off the railing, but before he could take a step forward Ben grabbed him by his sleeve.
Ben: "Wait, did you say that she's your wife?! When did you get married?!"