When you have information from three census records that match it can be accepted. The information in cenus records can come from anyone who was at home when the census taker came so can often not be correct on place of birth. Marriage records would be infformation from the people who married so i would take them as correct. You might try sending for a copy of marriage application. A person might not give their correct age on Draft cards. Might lie to be able to enlist. Information you find posted on internet sites need to be checked. Lately I have seen people attach parents for a person that is not correct. Even data published in books need to be checked in original records.