>>40515915 (OP)The design of grey aliens was created for a movie in the early 80s and was basically a vision of futuristic humans, small and not muscular because they are so very smart they don't need muscles anymore, with no hair and insect eyes to make them look weird and creepy. So of course that's what they look like, humans from the future, or altered humans. It's very unlikely that real extraterrestrials would look so much like us, unless we are somehow related.
A different theory is that they are not from the future but separated from Sapiens long ago and evolved in water, and they now live underground.
But as for the twins, they suffered from a sort of acromegaly.