Moriah Plath has a vulnerable moment with her siblings on Welcome to Plathville while taking off her wig for the first time in public amid her emotional journey with alopecia. "OK, nobody laugh. Or actually everybody laugh," Moriah, 23, tells her big brother Ethan Plath and younger sister Amber Plath in Us Weekly's exclusive sneak peek at the Tuesday, April 7, episode of the TLC series. "It helps when people laugh sometimes." Moriah proceeds to remove her blonde wig and reveal her bald head before trying on a new wig.