Laura Ruffino met her best friend, Liz Diamond, in the fifth grade. As adults, they both had children 2 girls for Ruffino and four girls for Diamond -- and kept their tight bond, Ruffino told ABC News. But in August 2014, Diamond, a single mom from Orchard Park, New York, was diagnosed with brain cancer, Ruffino said. She died just months later. "When we got in the car, she asked me, if anything ever happened, if I'd take her daughters. And I said, 'Of course,'" Ruffino said. "It wasn't even a thought." Ruffino is now seeking custody of Diamond's daughters, who are living with her. But Diamond's ex-husband, Elyson Pagayonan, appeared in court to contest the Ruffinos' permanent custody of his children according to Leonard Berkowitz, a lawyer for the Ruffinos. Pagayonan has not filed papers for custody of his children, according to the lawyer. Laura Ruffino said that one morning in December, Diamond wasn't fe...