They haven't been able to do much but patiently wait.
Sunday morning, family members of Jeffrey Comer, 50, of Tampa learned that his paddleboard, along with his wallet, car keys and cellphone, had washed up near the north entrance of the Manatee River.
He was nowhere to be found.
"We're sort of just sitting by the phone, waiting," said his mother, Maxine Comer, from her home in Yankeetown, just north of Citrus County. "Hoping to hear something."
Authorities were searching for Jeffrey Comer on Sunday and Monday in an area from Egmont Key to Anna Maria Island.
"We're just trying to process everything," said brother Tom Comer, 56. "We're all still kind of in shock."
In stand-up paddleboarding, which is shown on Jeffrey Comer's Facebook page, a participant stands atop a board— akin to a surfboard — and uses a long paddle to propel himself across the water's surface.
Comer's board and belongings turned up late Saturday night, and someone turned them in to Holmes Beach police.
Tampa police didn't find him at his Harbour Island apartment. His car was later found near Fort De Soto Park.
Comer has no known medical problems and kept active paddleboarding, kayaking and rock climbing at the gym, his family said. He also used to be an avid cyclist, once crossing the state.
"He was in good shape," his mother said.
She and her husband thought something was wrong when they didn't get their typical Sunday morning call from him.
Jeffrey Comer, a self-employed consultant working in government contracts, graduated from the Air Force Academy in 1983, his mother said. He served for a while before moving into research analysis with the government.