In Ohio, grandparents Frank and Marilyn Majni have been calling to sing “Happy Birthday” to all of their loved ones for decades. But after their granddaughter Adeline Petersen posted a video of one of their calls that went viral, hundreds of people from all 50 states and at least 15 countries sent birthday cards to celebrate Marilyn’s 90th birthday. NBC News’ Hallie Jackson has the story.

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