Does the government already know of aliens?

My brother talked to a new employee at his job and the guy told him that his dad was in the military, so later on my brother asked him if his dad knew if Area 51 existed, he said "Yes, but it's just a military aircraft hangar, but aliens exist too, the government has already made contact with them and also traded human software, which that is what the aliens call human brains, for some type of alien technology", then my brother asked where they got the brains from and he said "from prisoners that have no family or anyone, that are in prison for life".

I've never heard of any story like it until my brother told me it.