how many genes do siblings share
People are usually surprised to find that, when it comes to our genes, we are just as related to our parents as we are to our siblings! We share 1/2 of our genetic material with our mother and 1/2 with our father. We also share 1/2 of our DNA, on average, with our brothers and sisters. Identical twins are an exception to this rule. They share their entire DNA between them.