The first thing they did once Donna and Rose located their keys for Gringotts was purchase a wizard's residence outside of the town Ottery St. Catchpole named The Hourglass. When Donna first saw the monstrous three story house she complained "Its barely big enough for all of us."
Rose laughed at the shared look of surprise on her husband's and her brother-in-law's faces about Donna's statement. She pulled John and the Doctor into the house and showed them their rooms. John and Donna had the top floors, Rose and the doctor the first floor, and once Jess was old enough, She'd have her own rooms on the ground floor.
Donna left to talk to someone at the Ministry to have their fireplace connected to the Floo Network. She knew also that she needed a secure place to do her potion work, so she bought new equipment and ingredients to place in the work room she created behind the house. She also bought quidditch equipment including four Cleansweep Sixes, and a training broomstick for Jess when she's old enough. She looked at the shops on the street and saw that one was empty, and bought it for Rose to use for her clothes shop.
Once she was notified by the Ministry worker she'd been assigned for her return to the Wizarding World, she went home via Floo powder after having her purchases delivered to The Hourglass. She arrived to the sound of two full-grown Time Lords screaming like little girls at seeing her step out of the flames of the fireplace. She called upstairs to Rose "If you couldn't tell based on the two nancies down here screaming, I'm home! We've been connected to the Floo Network, so getting you to and from the shop won't be an issue now."
"What shop?" Rose said after apparating to the main room where the other three adults were near the fireplace. The Doctor and his twin winced at the sight of Rose suddenly appearing in the middle of the room.
"You were complaining about not having functional wizarding robes, so when I saw what you made for yourself, I thought that you'd like to set up your own shop." Donna shrugged and passed her the deeds to both the shop and workroom above it.
"Oh. And it would be a big hit among the Muggle-born witches and wizards that aren't fond of traditional wizarding robes." Rose mused, Accioing a pad of paper and a magic sketch pencil set that started drawing the designs in her head. She walked back up to her workroom on the first floor using the stairs as the paper and pencils followed her.
A few months passed, and Rose's shop was bustling with young witches and wizards coming in for the newest modern robes. She'd also branched out into protective robes for potion making, since Donna showed them off at the International Potion Master's Conference, Rose had begun to have customers from all over the Wizarding World.
John and the Doctor took turns babysitting Jess until she was old enough to go to school in town. The Doctor and Rose adopted her soon after she turned a year old when it was made apparent that even if the Doctor used the Chameleon Arch, they still couldn't have children of their own. After John and the Doctor only had to worry about picking her up after school, they began to become full-fledged members of the Wizarding community.
By the summer of Jess's eleventh birthday, she'd become a remarkably good chaser when her family went up against their neighbors the Weasleys. The twins Fred and George taught her all they knew about flying and pranking her parents, aunt, and uncle.
On her birthday, the Thirtieth of July, she received her letter from Hogwarts. When Donna looked at her list of books and supplies she said "We'll have to get you your first set of equipment for potions, a wand, Lockheart's books, and a familiar. Rose can make your robes and you can choose between my books and Rose's to finish off your list. We'll have to go to Diagon Alley tomorrow for everything, so We'd better tell your parents and uncle."
"May I have some ice cream at Fontescue's tomorrow?"
"Yeah. We can do that."