Recapping for those who weren’t here over the weekend – the family photo is suspiciously fake looking. There are two full auto machine guns ( the M-60 and the Uzi) that are difficult to own without special licenses. All the others are bare AR’s without any of the “tactical” bits that enthusiasts like to add like scopes, special stocks, etc. They’re not customized at all.
So the speculation is that the machine guns are probably decommissioned, either movie props or display items from a gun store. I suspect the bare AR’s are probably loaned or rented from a gun store. Maybe Dad actually does own all these guns, it’s just a very odd set for a serious gun collector and shooting family.