FORT WORTH - From the street, Jill Hill's home looks like most others in her Fort Worth neighborhood, Las Ventanas.
It's new construction, less than one year old, with plenty of room for her two kids.
But it's not until Hill opens a door next to the main entrance in the hallway that you see what really makes her home stand out.
It opens up to a 550 square foot attached apartment, a home within Hill's home. It's the reason she chose to buy the home; so her dad, Glen Wilson, could move in.
"Here's the hall entrance we can use to go in his apartment," she said. "This is his full living area, his front door. It locks just like ours."
The apartment has a kitchen, bathroom, master bedroom, and its own HVAC system.
"It's full independence," she said. "Once he saw it he realized, okay, it's not some shed in the backyard."
Jill is one of a record 64 million Americans in a multigenerational household, according to the Pew Research Center, meaning more than one generation of adults lives there.
"It's genius. If you think about what you'd be paying on a mortgage by yourself on a house like this. and then someone else also paying rent or a separate mortgage for a smaller home, it seems like a complete waste," said Hill.
According to the Pew Research Center, one in five Americans have moved in with their adult family members, often so they can combine incomes at a time when finding affordable housing is tough. Sometimes, baby boomers are moving in with their adult children, or adult children are moving in with their parents after a divorce, job loss, or simply while they look for a job after college.
"It's just so convenient and it's saved us both a lot of money," said Hill.
Builders are taking notice.
Lennar Homes has sold nearly 7,500 homes designed for multigenerational families nationwide since 2011. It has coined them "NextGen."
The builder has sold hundreds of homes like Hill's in DFW.
"It was really in a response for the need for people to be able to combine incomes under a single mortgage," said David Grove, Lennar Homes division president.
In North Texas, the homes run from $350,000 to $550,000.
For Hill's family, paying for the mortgage across generations makes sense.