With two sons in college and a third in high school, Sheri Clark Nadell of Brunswick is honoring a vow she made that her children wouldn’t graduate with student debt. She and her husband, Paul, are paying for their undergraduate education.

So far, that vow has cost them about $60,000, and they still have their youngest son’s tuition ahead of them.

“I don’t even know the exact amount (of debt) because if I did, I’d start to cry,” said Nadell. “But we can’t complain. We’re middle-class, incredibly blessed and we are both employed.”

At one point, Sheri and Paul were unemployed at the same time while still paying two college tuitions.

“We sort of took a big gulp,” Nadell said, adding that at one point they had to take out loans against their house and have family members help them out.

But that’s still better than having their sons take on the debt and graduate with huge student loan bills to pay, she said.

“It’s not OK, these kids coming out of college with all this debt,” she said.

“It’s got to stop. It has to level out at some point,” she said of the sharp increase in tuition. “It’s not increasing at the rate our salaries are increasing. Not by a long shot.”