In 2006, two-fifths or 40% of all working mothers relied on informal childcare, with grandparents being the most common source for a third of parents.

BBC: 'End of nuclear family' forecast

Mother had not liked having guests, particularly these guests, and this had been a recurring source of disagreement between my parents.

NEWYORKER: Naima

Next, we take action: I remind parents that food allergies are a proven source of stress, and I'm completely honest that the early adjustment period can be extremely difficult.

CNN: Food allergy diagnosis: What parents should know

The authors of this study say as children mature, they require less care and stress for parents -- and can become a source of support for moms and dads.

CNN: Does having children make you happy?

Another source of regret for Raymond Aubrac was his failure to persuade his parents to leave France for the safety of Switzerland even though he had secured false papers for them.

CNN: Nazi era French Resistance leader dies

Louis was a source of consternation to great numbers of the city's Jews, my parents among them, as was the quotation attributed to him in the paper's account of Lindbergh's brief visit.

NPR: Roth Rewrites History with a 'Plot Against America'

But Sweeney and others decided the service would eschew ads--a source of half a billion dollars in annual revenue for Nick at the time--to win over parents.

FORBES: Magazine Article

Michelson's interest in pets started during what he calls a difficult childhood, when his parents divorced (he was 11), money was tight and his dog was a source of comfort.

FORBES: Magazine Article