The crash happened at about 8.20pm on Monday evening outside Hopwas House Farm in Plantation Lane, Hopwas near Tamworth.
A total of four ambulances, a paramedic officer, a community first responder and the MERIT Trauma Doctor were sent to the scene.
A West Midlands Ambulance Service spokesman said: “All three cars had suffered quite a bit of damage which had left quite a lot of debris on road.
"The first car, an MG was most badly damaged. The driver, a man in his 30s had suffered a head injury.
"He was immobilised using a neck collar and spinal board before being taken to Good Hope Hospital.
“There were two elderly females in the second car. It had ended up in a hedge.
"One of the ladies was suffering from neck and shoulder pain. She too was immobilised and taken to the same hospital.
"There was a family with two young boys in the third car. It had suffered extensive damage to the driver’s side.
"The man driving had a nasty fracture to his left leg. He was given pain relief before being immobilised and taken to Heartlands Hospital as a precaution.
“His 6 year old son, who was in a car seat, had dislocated his shoulder. He was also immobilised before being taken to Heartlands as well.
"Mum and younger son travelled with the youngster.”