Isaiah's maternal grandfather, Paul Krey, told KARE-TV (http://kare11.tv/18ni2Ql ) that the car belonged to a customer of his son-in-law, who is a mechanic and works out of a shop on his property. Krey said the car was parked there and waiting to be fixed. All the Theis children were comfortable hanging around the shop and spent plenty of time around the vehicles while their father worked, the grandfather said.
The boy's mother told investigators Isaiah was last seen about 7:30 p.m. Tuesday while playing with his 7-year-old brother at their home near Centuria, which is about 60 miles northeast of St. Paul, Minn.
About 2,450 civilian volunteers helped search the fields and woods surrounding the family's home throughout the day Wednesday, the sheriff said.
Debbra White, 51, of Milltown, Wis., left a teddy bear and a wind chime at a makeshift memorial near the scene. White told the Star Tribune of Minneapolis that she lost her 8-year-old son more than 20 years ago when he drowned in the St. Croix River.
"There's nothing I can say to bring their son back," White said.