When it comes to his sister, Curtis Ingraham doesn’t exactly hold back. Over the past year or so, Ingraham has won a reputation — and a significant Twitter following — for attacks on his high-profile sister, Fox News host Laura Ingraham. At different times and on a wide variety of platforms, he has called his sibling “a monster,” “a Nazi sympathizer” and a “racist.” But after the controversial pundit compared Greta Thunberg and other youth climate activists to Stephen King’s “Children of the Corn” on Monday night, Curtis Ingraham took things to the next level. “Clearly my sister’s paycheck is...