1. The blood types of your family depend on their genetics. You need to ask them or check their medical records to know. Common blood types are A, B, AB, and O, and each can be Rh-positive (+) or Rh-negative (−).2. Your blood type can only be known through a blood test. It’s usually written in your medical records or ID if you've been tested.3. Knowing your blood type is important during emergencies like accidents or surgeries where you might need a blood transfusion. It helps doctors give you the right type of blood to avoid complications. It’s also needed during pregnancy and organ donation.