More immediately, they're preparing for "a pretty good Christmas" and anticipating an onslaught of requests for financial help.
"When it's that big of a Powerball, you're going to get people coming out of the woodwork, some of them might not be too sane," Cindy Hill said. "We have to protect our family and grandkids."
The jackpot was the second-largest in U.S. history and set off a nationwide buying frenzy, with tickets at one point selling at nearly 130,000 per minute. The other winning ticket was sold at 4 Sons Food Store in Fountain Hills near Phoenix. No one has come forward with it yet, lottery officials said.
Before Wednesday's drawing, the jackpot had rolled over 16 consecutive times without someone hitting the jackpot.
Myron Anderson, pastor of the Baptist Church in nearby Camden Point, said he heard Thursday that the Hills had won the huge prize. Anderson said he has known Mark Hill since they attended high school together.
"He's a really nice guy, and I know his wife, and they have this nice little adopted daughter that they went out of their way to adopt," Anderson said. Funeral services for Hill's father were at the Baptist church, but the family attends church elsewhere, he said.
"I hope it's good news for them," Anderson said. "I've heard awful horror stories about people who get all that money in their lap and how everybody treats them, and if you don't mind me saying, I mean just the fact that the press is going to be after them."
Kevin Bryan, a lifelong Dearborn resident, said the only other local lottery winner he could remember was a farmer who won about $100,000 in scratch-off game years ago "and bought himself a combine."
In a Mega Millions drawing in March, three ticket buyers shared a $656 million jackpot, the largest lottery payout of all time.