Robert Danno, 50, and Jose Fernardo Martinez-Hernandez, 24, appeared in court in Bridgeview, the Chicago Tribune reported. Both were charged with the first-degree murder of Mary Ann Urban-Danno, 51, and Theresa Urban, 79.
Cook County Sheriff Tom Dart said the car, a PT Cruiser, belonged to Urban-Danno and her husband had burn marks on his arms when he was arrested Monday, the Southtown Star reported.
"This was one of those ones where we found ourselves questioning the planning and thought behind some of this," Dart told reporters Tuesday.
Investigators say the women were strangled in Chicago and the bodies driven to Palos Township, a suburb a few miles to the west of the city.
A spokesman for the Cook County sheriff's office said a car on fire was reported just before midnight Saturday in the Cap Sauers Holdings Nature Preserve, the Chicago Sun-Times reported. The bodies were found after the firefighters had extinguished the blaze.
Dart said Martinez-Hernandez lived in the Danno home in the basement, describing him as a friend of the family, the Star reported.
Urban-Danno was apparently planning to get a divorce, Dart said. Her mother owned real estate and had about $500,000 in the bank.