Authorities are still searching for a woman from northwest Iowa who may be on the road with nine children. The woman’s husband, Donald Boss, is jailed in Sioux City, charged with killing his eight-year-old child. Plymouth County Sheriff Mike Van Otterloo says they believe the wife may be headed to Michigan. The children range in age from six months to 15 years.The Sheriff says a relative of eight-year-old Timothy Boss tipped off authorities.The family member said the kid hadn’t been seen for 18 months. Van Otterloo says they believe the child was murdered at the family residence in Remsen.The couple’s tenth child is staying with relatives. Authorities have issued a warrant seeking 33-year-old Lisa Boss, the mother of the brood, as a material witness to the murder. The family moved from Michigan to Iowa about three years ago and settled in Remsen, which is about 40 miles northeast of Sioux City. Cops says Lisa Boss may be driving a blue Ford Windstar van with Michigan plates.