Neanderthal DNA still survives in our human family tree. What were our ancient relatives' relationships like?

Summary
Developing research suggests that ancient interbreeding wasn't random — it was socially patterned, directional and far more complicated than the headlines suggest.
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Neanderthal DNA still survives in our human family tree. What were our ancient relatives' relationships like?
Developing research suggests that ancient interbreeding wasn't random — it was socially patterned, directional and far more complicated than the headlines suggest.