Scientists in England may have just solved a mystery that stretches back for thousands of years. It is the tale of two mummies, thought to be brothers, that have been displayed at the Manchester Museum for more than a century who, as it turns out, may actually only be half brothers.

The relationship between the two mummies have been debated by scientists for years, as some had argues that their skulls were shaped differently, or the complexion of the scraps of skin from their bodies appeared to be different. But the museum continued to portray them as full brothers, allowing the debate to rage on behind the scenes.

Now, it appears that the mystery has been settled, as a genetic test indicates that while they are related and do appear to be brothers, they are only half brothers. The siblings, Nakht-Ankh and Khnum-Nakht, are about 20 years apart and probably had the same mother but different fathers.