From an NPR article about DNA and learning more about our ancestors who live in caves.
"For example, a group in Spain published a paper this week analyzing the DNA from 12 Neanderthals found in a single cave. The analysis suggested the men were all brothers or cousins, whereas the women had come from different bands."
This amazing. It is something we could only speculate prior to this science. Once again women account for human diversity and men collectively protect thier domains.