documentation of information

I'm curious on what others do about putting a record that someone else gathered and shared but with no documentation. When it's the same town it's easier to accept but when it takes you to another state in Mexico I'm not sure if I should use it. It's not my direct line but my cousins line and the info takes it back to the late 1500's in Mexico when I only have it back to abt 1850. I always try to share my documentation when sharing files. Any suggestions?

Linda in Everett