Final answer:
If an entire family is complaining of a headache, it is possible that they may be experiencing tension headaches. These headaches are commonly triggered by muscle tension in the face and neck, and can be caused by stress, poor posture, eye strain, and lack of sleep.
Step-by-step explanation:
If an entire family complains of a headache, we should suspect that they may be experiencing tension headaches. Tension headaches are the most commonly experienced type of headache and are triggered by tightening/tensing of facial and neck muscles. They can be caused by factors such as stress, poor posture, eye strain, and sleep deprivation.