Continuing its run through the opposition ads of the “Never Trump” movement, the “super PAC” supporting Hillary Clinton released an emotional ad on Monday featuring an Ohio family with a disabled child who criticize Donald J. Trump for mocking a disabled journalist.

On Screen

A husband and wife tell their story, side by side, of learning through an ultrasound that their daughter, Grace, would be born with spina bifida, a spinal condition. Images of young Grace flicker by — as a newborn in the hospital, sleeping near a cross, smiling and offering a hug from her wheelchair — while her parents tell of her loving personality: “She brings out the goodness in each person.”

Twenty seconds in, the mother shifts to Mr. Trump, saying, “When I saw Donald Trump mock a disabled person, I was just shocked.” A well-known clip plays in full of Mr. Trump imitating the journalist, a New York Times reporter who has a condition that limits the functioning of his joints. Then the mother offers a reproach: “The children at Grace’s school all know never to mock her. And so, for an adult to mock someone with a disability is shocking.” Visuals of Mr. Trump’s imitation are played again for good measure.

The husband concludes the ad: “When I saw Donald Trump mock someone with a disability, it showed me his soul. It showed me his heart. And I didn’t like what I saw.”