Just to clarify in my Harry Potter universe this is what happens:
Harry James Potter becomes an auror and later changed career's and teaches Defense Against the Dark Arts at Hogwarts. He married Ginerva Molly Weasley, who becomes a healer and they had three children. James Sirius Potter, a Gryffindor who is as troublesome as his father and grandfather, but has always got the backs of those he cares about; and the seeker for his quidditch team. Albus Severus Potter, a Slytherin who didn't let his house determine who he became, he wore his name with pride, the seeker against his brother. Lily Minerva Potter, a Gryffindor who was one of the brightest in her class, yet loved to pull pranks like her uncles.
Ronald Bilius Weasley became an auror and stayed with that career. He married Hermione Jane Granger, who became head of the Department of Magical Law Enforcement, as well as revising many books that she found to be outdated. They had two children together. Rose Nymphadora Weasley, a Gryffindor who was just like her father, loyal to her friends and just as much of a slacker. She did become one of the three chasers for the Gryffindor quidditch team. Hugo Alaster Weasley, a Ravenclaw, who was just like his mother when it came to education, and got his friends out of some pretty sticky jams.
Neville Longbottom started as the herbology teacher at Hogwarts and head of Gryffindor house; later he became the Headmaster of the school that taught him so much. He married Luna Lovegood, who got a position on the Daily Prophet but turned it down and ran the Quibbler, turning it into a respectable newspaper. They had a son, Frank Colin Longbottom, Gryffindor and best friend of James Potter. The two were the leaders of Gryffindor, though they weren't bullies in anyway. Frank never let his friends down and was Keeper for his school quidditch team.
Lavender Brown got a position in the Department of Mysteries. She married Ernie MacMillan who ran the Department of Transportation at the Ministry. They had twins Landon and Trinity. Landon was in Ravenclaw like his mom, and Trinity was in Gryffindor. They became best friends with Albus and Rose, they watched quidditch from afar.
Dean Thomas married Padma Patil; they both worked in the Ministry in the Department of Mystries. They had a daughter, Bethany Thomas; she went into Gryffindor and was best friends with Rose and Albus. Seamus Finnigan and Parvati Patil married and worked in the Department of Misuse of Muggle Artifacts with Arthur Weasley. They had Alexander Finnigan, who was a Gryffindor along with most of his friends. He was the last in the group that were the best friends of Albus Potter.
Bill Weasley managed Gringotts bank and worked reversing curses on artifacts. He married Fleur and they had Victorie, a Gryffindor and chaser for the quidditch team. She married Teddy Remus Lupin, Harry's godson, a beater for the Gryffindor team. He was just like his father, except for the werewolf part. Charlie Weasley never married, but continued to study dragons; his family visited him in Romania constantly.
George Weaslely married Katie Bell and they had Fred Weasley, the spitting image of the brave man he was named after. George continued to mind his chain of joke shops, while Katie managed her quidditch store for women, along with her best friend Alicia Spinnet. Alicia married Oliver Wood who went on to play professional quidditch, unitl he had to retire due to too many bludgers to the head. Lee Jordon and Angelina Johnson married and continued the infamous radio show that started up during the war. Percy married Penelope and the two worked at the Ministry, right where they belonged.
Draco Lucius Malfoy married Pansy Parkinson and they had Scorpius Malfoy. As was expected he became a Slytherin and keeper for his house team. Draco did something that gave him lots of money and Pansy didn't work. But most people never care about the villains; let's just say that the legend lived on. Potter's and Weasley's never got along with Malfoy's.
So Harry Potter and his friends truly lived out their days in happiness. They did what they loved till they couldn't, and they kept in close contact. Monthly dinners at rotating houses, children that became the best of friends, a past that made them heroes, memories that were impossible to forget, and a scar that was finally just a scar.
