Emergency services were called to Sandwell Place, Willenhall, after a vehicle ploughed into a parked car and tipped over at around 6pm on Sunday, November 15.
Three managed to escape from the wreckage but another had to be cut free after becoming trapped.
West Midlands Ambulance Service said they were called at 5.49pm to reports of a car that had come to rest on its side on Sandwell Place.
Two ambulances and a paramedic officer attended the scene, to find four patients from the car, two adults and two children.
They were all treated for injuries not believed to be serious before being transported to Walsall Manor Hospital.
A spokesman for West Midlands Fire and Rescue Service said: "We were called at 5.51pm to reports that a car had been in collision with a parked car and had overturned.
"Three patients were out prior to our arrival but crews from Willenhall and Bloxwich had to use cutting equipment to free the fourth."