Clinton's ad "Grace" features the parents of Grace, a disabled child, and a clip of Donald Trump mocking a reporter with a disability.
This ad very effectively uses ethos to attack Trump's character, because it literally shows a clip of him giving a speech, and there's no denying that he did what he did. The ad works hard to show you that these parents are real people, the reporter Trump mocked is a real person, and that what Trump did was real, and this quality makes the ad really effective.
Grace's parents talk about Grace's experiences being disabled, and how it really hit them hard when they saw Trump mocking a disabled man. The parents say that that moment showed them Trump's true character and they "didn't like what they saw."
Pathos appeal is used many times in this ad. You sympathize with Grace, her parents and their story, and with the disabled reporter, whose picture is also shown in the ad. The ad also makes you angry at Trump, and sides with the parents.