It's Always Sunny in Philadelphia - Season 16 Episode 2 -

After Frank shoots Dennis and Dee, they resolve to take Frank's gun away. Mac and Charlie go on a road trip with their moms to get their inheritances -- for Mac, it's letters written by his grandfather which have fallen into his Uncle Donald's hands, while for Charlie, it's a jar of teeth that is now in the hands of his sisters, Bunny and Candy.