Disclaimer: JK Rowling owns all.
Adam Lee Weasley
July 7, 2034
Fred and Nellie Weasley absolutely adored their two children, twelve-year-old Tommy and four-year-old Holly, but they couldn't help but feel as though something was missing. They knew that their son would never forgive them if they had another child, as it was already annoying enough for him when he received the confused looks from his friends that he had a four-year-old sister at home. They all thought that it was strange, seeing as he was eight years older than his closest, and only, sibling. However, Fred and Nellie couldn't help but feel as though they were being called to have another child.
Because of this odd premonition, the two couldn't help but be grouchy with each other, as they both wanted that third child but didn't think the other one wanted it, so they didn't voice it. Because of their increasingly annoyed and angry attitudes for each other, they began to fear that they would have to get a divorce, which was very unheard of and unsupported in the wizarding world. However, they tried to work through it, and eventually they were successful, especially after they both realized that they wanted the same thing.
So, Nellie became pregnant with their third child. It wasn't a walk in the park for either of them, as Nellie was much older than she had been when she was pregnant with Tommy, so that presented its own problems (like frequently high blood pressure) to them. Nellie was on hospital bed rest with two months still to go in her pregnancy, and nothing could have prepared Fred for her annoyed attitude. He constantly brought her magazines, and him and Holly visited when he was off of work.
Finally, and much to the relief of Fred Gideon Weasley II, his second son, Adam Lee Weasley, was born on July 7, 2034. Adam grew up to have his mother's brown hair but his father's brown eyes, was sorted into Ravenclaw, and held the position of Seeker in his first year until the end of his seventh.