Harry's years before Hogwarts
Over the years, Harry grew up happy and loved with Grandma Ari, Uncle Paddy, Uncle Moony and Uncle Sweets. Albus, after Arianna yelling at him a lot, became almost a constant feature in Harry's life. He would sneak Lemon Drops to Harry, even though it drove Arianna insane. He would also help Sirius, Remus and Harry prank either Arianna or a visitor. Because of this, Albus became Harry's favourite uncle (albeit a great-great-uncle).
Because of Albus, during the holidays, Harry would always be at Hogwarts for lunch. In his cute little ways he wormed his way into the hearts of all the teachers, even Severus Snape. Harry had nicknames for all the members of staff, some of which annoyed the teacher in question but made the others laugh. He even had it written down on a piece of parchment so he didn't forget and he could show it to others.
Harry Potter's list of nicknames for teachers
Albus Dumbledore: Uncle Sweets
Minerva McGonagall: Aunty Tabby
Severus Snape: Uncle Bat
Filius Flitwick: Uncle Shorty
Pomona Sprout: Aunty Plants
Poppy Pomfrey: Aunty Scary
Rubeus Hagrid: Uncle Softy
Irma Pince: Aunty Shush
Rolanda Hooch: Aunty Hawk
Aurora Sinistra: Aunty Stars
Severus' nickname made most of the other teachers laugh. When Harry had first met him, Severus had stalked out of the room and his cloak billowed after him. Harry instantaneously thought of a bat and Severus became Uncle Bat, but he didn't mind after Harry wormed his way into his heart, a feat that amazed all the other members of staff. Poppy's nickname also caused a lot of laughter among the teachers. Harry had fallen off a broom and hurt himself. Poppy insisted that he stay the night in the hospital wing, forcing him onto a bed. Harry thought that Aunty Scary fitted her and always tried to avoid having to go to the Hospital Wing. If he wasn't hurt, she was lovely.
Over the years, he also became friends with lots of other people. Neville Longbottom became his best friend as they had both lost their parents and were looked after by their great-grandmothers. He was also friendly with Luna Lovegood after meeting her in Diagon Alley one day. Luna was a bit weird, but fun if you got to know her. Harry was also friends with Nymphadora Tonks. She was 6 years older than Harry, but her mum, Andromeda (though everyone called her Andi), was a cousin of Sirius. Nymphadora hated her first name, but allowed Harry, Neville and Luna to call her Dora, something that she only let her mum and dad do. Dora became something of an older, clumsier sister who always had something funny to say.
Harry also knew other children his own age as Arianna would often take him to Ministry Parties where he would play with the other children. Susan Bones, Hannah Abbott, Daphne and Astoria Greengrass, Tracy Davis, Terry Boot, Blaise Zabini and the Patil twins, Parvati and Padma were ok and he sometimes asked them over to Potter Place.
Harry, however, found people that he didn't like. The Weasley's were a bit annoying and their youngest son, Ron, who was 4 months older than Harry, seemed to think that Harry should be best friends with him and kept alienating Neville, Luna, Susan, Hannah, Padma and Parvati. In the end, Arianna had to curse him to keep him away, but he still followed them. The girl, Ginny, was such a fan girl that she kept following Harry and his friends around, staring at him with awe and amazement. The twins, Fred and George were ok, but they didn't like Slytherin's, something that annoyed Harry as his Aunt Andi had been a Slytherin and she was lovely, as was Uncle Bat and Aunty Stars. Draco Malfoy also annoyed Harry, he always said 'When my father hears about this…' or 'My father said…'. He also thought that everyone should bow down to him and that loads of people were blood-traitors, like Andi, who was Draco's aunt.
Overall, Harry's childhood was filled with pranks, sweets and friends. It was much better than what his childhood would have been like if he had been raised with the Dursley's.