While they will never be exactly on, the FBI has approximate numbers on every family. This comes from decades of investigation on their part. Once again, 15 years ago the feds had the Detroit family at 30 members at most. Fast forward to the present, some have died and some more may have been made, but it's likely that the current total is not over 30. But you ignore all this in favor of different lists you see on the internet because you want to go with whatever shows a bigger number. You're not looking at this objectively.