Now Playing: Amazon, Berkshire and JP Morgan to form a new health care company
Now Playing: California med student fulfills dying dad’s wish to see her graduate
Now Playing: Woman experiences total solar eclipse with her dying father
Now Playing: Daughter gives dad kidney for Father’s Day
Now Playing: Sarah Murnaghan Home After Double Lung Transplants
Now Playing: Lung Transplant Patient Breathing on Her Own
Now Playing: ‘GMA’ Hot List: Blake Lively says she borrows husband Ryan Reynolds’ clothes
Now Playing: Grooms dress as Woody and Buzz Lightyear at Disney-themed wedding
Now Playing: In case you missed it: Meghan Markle’s rescue dog has his own book
Now Playing: New season 27 celebrity cast of ‘Dancing With the Stars’ busts a move
Now Playing: ‘Dancing With the Stars’ pros put on an unbelievable Times Square show
Now Playing: Real-life ‘Dancing Doctor’ livens up hospital stays for kids
Now Playing: Watch Michael Strahan and Sara Haines bust out their dance moves
Now Playing: Are you someone who thrives on negative feedback?
Now Playing: Giggling grandma reading ‘The Wonky Donkey’ sparks book sales
Now Playing: ‘DWTS’ season 27 cast competes in a dance-off on ‘GMA’
Now Playing: Blake Lively opens up about parenting and kissing Anna Kendrick in ‘A Simple Favor’
Now Playing: ‘Dancing With the Stars’ season 27 cast speaks out on ‘GMA’
Now Playing: Bruno Tonioli and Carrie Ann Inaba dish on new season of ‘DWTS’
Now Playing: ‘Dancing With the Stars’ season 27 cast revealed: DeMarcus Ware, Tinashe and more