I have assumed the person that drove Sandra to and from the mechanics was the grandkids father, and that he had them in the truck when he dropped Sandra off at home and then took the children to their house. Otherwise who was with the children until their parents returned from work?
Or was the person that took Sandra home via the convenient store a different person than the one with the children?
I agree with your assumption because of the presence of the kids. The family member who took her home is portrayed in all MSM articles as the same person who drove her to the mechanic in the first place.