They were serenaded by Mylie Cyrus during the cold open On the Mother's Day episode of "Saturday Night Live," the cast kicked off the show by (as is traditional) ditching the normal kind of cold open sketch for a tribute to the cast members' moms. This time, musical guest Miley Cyrus sang a song while the cast members did some fun jokes with their IRL moms and yes, it was absolutely adorable. Some of the jokes were just fun, like when Aidy Bryant's mom promoted Bryant's Hulu series, "Shrill." Others were honestly touching, like the apparent reveal that Cecily Strong hasn't . . .