Mark Honeyman went from being an only child to having 7 siblings and 37 nieces and nephews. Adopted at birth, he started a search for his birth parents several years ago to learn where his essential tremor came from. That led him on a journey with many twists and turns, and fascinating stories. He says having ET has humbled him and made him a better person. "And it's led to so many insights that I'm profoundly grateful for it."