SACRAMENTO -- It has now been four days since Karla Jackson has seen her son and granddaughter.
"They need to come home," Jackson told FOX40.
Kyler Jackson and his one-year-old daughter Kaylee were last seen in Antioch late Sunday evening before they headed home to Sacramento however they never arrived.
The United States Coast Guard searched the Sacramento River along Highway 160 Tuesday - the route family believes the 23-year-old Jackson used to come back to Sacramento, fearing he may have fallen asleep and gone into the river.
"It's not like him to not call anybody to not let anybody know where he is it's a mystery," said Jackson.
The Antioch police department and the Sacramento Police Department are leaving the joint investigation into the daddy and daughter's whereabouts.
The Sacramento Police Department says it has reviewed it's database of license plate scanners and is not seen anything since the two went missing earlier in the week.
Kyler Jackson has another daughter as well, the 6-year-old graduated kindergarten Thursday.