Now Playing: Warning for parents as summer pool season gets underway

Now Playing: Trump tries to blame Democrats for policy of separating migrant kids and parents

Now Playing: One escaped inmate back in jail, two remain on the loose

Now Playing: The Midwest slammed with severe weather

Now Playing: Dad celebrates Father's Day after saving son's life

Now Playing: Amazon gets in on the Father's Day celebration

Now Playing: Giuliani asserts Mueller and his team should be investigated

Now Playing: Superstar couple Jay-Z, Beyonce release new joint album

Now Playing: Jimmy Kimmel goes one on one again with Ted Cruz

Now Playing: Passenger describes chaotic scene before roller coaster derails

Now Playing: Toddlers crawl into outdoor pool

Now Playing: Theranos CEO faces criminal charges

Now Playing: Two riders plunge to ground after roller coaster derails

Now Playing: 3-year-old missing girl rescued by family dog

Now Playing: Stella McCartney to make 46 replicas of Meghan Markle's wedding reception gown

Now Playing: Last-minute gifts for Father's Day

Now Playing: Police-involved shooting on busy San Francisco street

Now Playing: Manafort sent to jail

Now Playing: Two Kansas sheriffs killed while transporting inmates

Now Playing: Giuliani says Trump to decide if he will meet with Mueller by July 4