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As Lauren Smith and Matt Hendrickson drive home together, all conversation about work must stop a few blocks from their house.

The couple came up with the idea after starting a business together.

"That's our cutoff point, so when we go into the house, we can have a normal personal life," Lauren says.

Marriage and other long-term relationships aren't easy. And running a small business is no picnic. Putting the two things together can make life complicated for the happiest of life partners.

Still, millions of people run businesses with their significant other every day. It's not known how many couples own and run a business together, but the number runs into the millions. The most recent Census count, in 2007, showed 1.4 million companies that were co-owned and equally operated by husbands and wives. That doesn't include businesses owned by unmarried domestic partners or same-sex couples. The Census counted another 2.3 million companies owned by spouses but primarily operated by either the husband or the wife.

There's no formula for making a success out of a business that is owned by a couple — or for also keeping their home life happy. Many couples make disagreements part of their decision-making process. Some set their egos aside and listen to one another. And some, like Smith and Hendrickson, find that they need to take a break to keep working well together.

Setting limits

Smith and Hendrickson started Ascendify, a San Francisco firm that helps companies add social media to their online job postings, in April 2012, less than a year after they were married. Matt brought 20 years of high-tech experience. Lauren had worked in advertising.

Building a business together has its perks. Long hours working on a startup leaves little time for much else, the couple says.

"It became an all-inclusive, all-encompassing mind-share. We ended up working on it nights and weekends," Matt says. Besides their self-imposed curfew on the drive home, the couple schedules activities to keep the company from taking over.

"We'll have a date night here or there, or go on a hike," Matt says. "If either of us talked about work on date night, we'd get in trouble with each other."

The business is doing well enough that they've been able to hire two employees and plan to take on a third.

Compromising

Natasha and Chris Ashton have learned a big lesson from owning a business together: The only way to end an argument is to compromise.

"We never reach an impasse," says Natasha, co-CEO with her husband of PetPlan, a company that provides health insurance for pets. "One of us backs down and we make a joint decision.

The Ashtons decided to start a pet health insurance business after their cat, Bodey, ran up $5,000 in vet bills. They had looked for insurance for her, and discovered it was relatively unknown in the U.S. while being very popular in Britain, where the couple comes from.

"It became apparent to us what a tremendous opportunity it was," Natasha says.

They started the Philadelphia-based company after they got their MBAs in 2003. It wasn't always smooth. There were heated debates, and the Ashtons found that they needed to work out their differences.

"You can't get held up or let emotions override your ability to make a decision," Natasha says.

At first, the Ashtons were both involved in every aspect of PetPlan. As it grew — it now has 80 employees — they each took on distinct roles. Chris handles the financial and insurance end of the business, while Natasha focuses on marketing and public relations.

That has allowed them to expand their business. The couple started an animal health magazine called fetch! in 2008, and believe there are more ways to profit from their love of animals.

"Our main debates now are about strategy and where to allocate our resources," Chris says.

Getting perspective

Pam and Mark Fisher started their Boston-area construction business in 1991 after losing their jobs. Pam had worked for a small bank shut down by the government. The construction company where Mark worked also closed. The country was in recession and the job market was tough, so they launched Construction Coordinators, a contracting business that primarily handles renovations for restaurants, stores and offices.

The couple had the added stress of raising two young children. Mark landed one client right away through his former employer. After that, it took lots of cold calls to grow the business. Along the way, they had to learn how to reconcile their different approaches to a challenge.

"I tend to focus on the technical aspects and Pam focuses on the people aspect of it," Mark says. "She's really quick to understand what might be motivator behind what happened, and I'm quick to figure out, how do we fix it?"

The Fishers say having their own interests is important. Pam belongs to organizations including a women's real estate organization and a women's networking group. Mark belongs to professional and trade groups focusing on architecture and entrepreneurship. Time apart provides perspective, Mark says.

"Having outside activities helps us remember why we're here. It helps make it easier for me to step back and see where Pam's coming from."

They also made a point to celebrate the business within their family. After completing projects they brought the kids to see what mom and dad had been up to and took pictures at the sites. The outings resulted in an album that shows their business achievements and their children's growth.

Over the years, they found that working together helped with personal matters like taking care of their children and their and aging parents. They also have figured out how to keep the business running when family issues inevitably crop up.

A learning process

Natalie and Carlos Giron are still learning how to work together as business owners. It's a difficult process because it's complicated by worries about money.

Carlos lost his job with a public relations firm at the end of 2008. Natalie was working as a teacher at a Catholic school. The couple decided the best way to support themselves was to invest Carlos' $5,000 severance pay into a learning center and tutoring business in the New York City borough of Queens.

Natalie runs Mrs. Giron's Tutoring and Learning Center, working with children and their families, and overseeing as many as five part-time workers. Carlos runs the center's website and does the marketing while also building his own business as a marketing consultant.

Owning a business has put a lot of pressure on the couple.

"When I was a teacher, I was more relaxed. He was the main breadwinner," Natalie says.

Carlos is stressed, too. They have had arguments over the direction of the business, like whether to raise fees. At one point, Natalie questioned whether they should stop running the business together — or if they should even run it at all.

"If the business brings us money but ruins our relationship, it's not worth it," she told Carlos.

Slowly they have learned to work better together. It helped when Carlos did some work with the children, and began to understand Natalie's point of view.

"It's only recently that I have changed my mind-set, and he has also changed his way of looking at things," Natalie says. "Both of us have learned how to trust each other, that we mean well and we want to share our partnership."

Joyce Rosenberg covers small business for The Associated Press.