You are an archeologist and you have found a tomb with ancient Egyptian mummies. You know that each person has two types of genes, where one type is inherited from the first parent and one type is inherited from the second parent. For example if the first parent has XY genes and the second parent has WZ genes, then their children can be any of the following: XW, XZ, YW and YZ. Note that the order doesn't matter, so XY is equivalent to YX. You have found 10 mummies in the tomb with the following genetic makeup:
AA, AB, AC, AD, BC, CC, CD, CE, DD, DE
You know that they all come from the same family tree. You also know that each person has either none or both parents present. What can you establish about their relationship to each other?