“Relationships don’t last anymore,” observed comedian Rita Rudner. “When I meet a guy, the first question I ask myself is, ‘Is this the man I want my children to spend their weekends with?'”

Great joke — horrible reality. A new solution is on the horizon, though. After years of research, writer and activist Emma Johnson has come up with the best answer to the question of which parent should get majority custody of the children after a divorce. 

You can guess it from the title of her new book: “The 50/50 Solution: The Surprisingly Simple Choice that Makes Moms, Dads, and Kids Happier and Healthier after a Split.”

“Whether they live in separate homes by divorce, separation, or maybe they were never together in a relationship to begin with, a 50/50 schedule is what is going to be best for the children’s outcomes,” says Ms. Johnson, the Solomon of divorce. 

It’s also “best for the moms, in terms of their income-earning ability and well-being,” she adds. “And it’s really what’s best for dads and men.”

Ms. Johnson has spent more than a decade running the wildly popular Wealthy Single Mommy blog, advising moms struggling with money, child care and dating issues. Part of the problem, she quickly realized, is that the culture has come to believe it’s a no-brainer that divorced moms should get majority custody of the children.

But there’s no real reason for that assumption, says Ms. Johnson, a divorced mom herself. That model was based on “these old, dated ideas about attachment — the idea that more time with mom, with one single caregiver (is best). I bought into that idea myself,” she admits.

Bonding with both parents is better, because when the dad is truly a co-parent, he is far more likely to stay in the children’s lives. “And father absence is a huge, huge risk factor for kids that plays out throughout their lives,” Ms. Johnson says.

The weekends-only model “signals to the dad that he doesn’t matter because he’s got the children 30 percent of the time,” says Ms. Johnson. It signals this to the children too.

Relegated to second-tier status, and absent from day-to-day family life, dads are more likely to drift away. Bonding comes from dealing with “the good and the bad. Getting your 4-year-old to get their shoes on and out the door. You fight about bath time and you get to have that snuggle bedtime story,” Ms. Johnson says. Without that whole spectrum, dads “don’t develop as parents.”

The weekends-only arrangement is stunting them.

What happens when the arrangement is 50/50? Ms.  Johnson points to Kentucky, an early adopter of the equal parenting law. After it passed, she says, domestic violence filings went down. So did child abuse.

In Ohio, where some districts have adopted the 50/50 law and others haven’t, her research found the same thing: In the 50/50 pockets, “substantiated child abuse charges were lower.”

Right now there are dozens of bills throughout America that would make equal parenting schedules the default. Who is against them? Sometimes divorce lawyers, Ms. Johnson believes. After all, they do best when parents keep fighting. She also blames the old-school notion that, in a divorce, it is the dad’s job to give their exes space and money, period.

Yet only 40 percent of child support ever gets paid. And for struggling families, that support can amount to just a couple hundred dollars a month, Ms. Johnson says. In which case having child care half the week would allow moms to make more than that.

“Historically,” Ms. Johnson says, “divorce was a fight, and how do you win? You take his money and you take his kids and then you win.” But with a 50/50 law, “you take the fight out of it.” You keep both parents in, which keeps the divorced family, in its own way, intact.

Creators.com