Disclaimer: JK Rowling owns all. Thanks to alohamora080 for this wonderful idea, and I have decided to do it for the third generation, so not the next generation, like she did it for.
Andromedora Ginevra Lupin
January 1, 2020
If someone had informed seven-year-old Teddy Lupin that he would someday marry his five-year-old counterpart and best friend, he would have shouted "Gross! Cooties!" If someone had told fifteen-year-old Teddy Lupin that he would one day marry his best friend, thirteen-year-old Victoire Weasley, he would've said, "Um, I've got a girlfriend, so no thank you." If someone had explained to nineteen-year-old Teddy Lupin that he would marry his girlfriend, seventeen-year-old Victoire Weasley, he would've smiled and said, "I know, isn't she wonderful?"
Teddy and Victoire had been best friends for as long as they could remember. They had played together, fought with each other, and were as close as siblings that didn't fight all that often. So, needless to say, it was no shock to the family when Teddy and Victoire started dating right before her seventh year. It was a shock, however, that they were engaged right after Victoire graduated, so when she was eighteen and he was twenty.
The two received blessings from the Weasley-Potter clan, as well as Teddy's grandmother, Andromeda Tonks, so they continued with the wedding even though they were really young. When Teddy said, "I do" he knew that his parents were watching him from Heaven, and so he smiled even broader, if that were possible.
Then, a year later, Teddy and Victoire found out that they were pregnant. With a girl. Victoire let Teddy pick the name, only because she felt that he might want to name it after his mother or grandmother. However, she made it a point to him that if they had another girl, she would get to name it. When Teddy finally chose her name, he decided to keep it a secret until the baby was born, so not even Victoire knew the baby's name ahead of time.
When his daughter was born, bright pink hair, blue eyes, and all, Teddy proclaimed her to be Andromeda Ginevra Lupin, Andie for short. Victoire burst into tears about how wonderful the name was, and how it fit their metamorphmagus daughter brilliantly. Andie grew up to be a kind Hufflepuff, just like both of her parents.