Every family carries stories that everyone believes but nobody has ever actually verified against a record. That is not a flaw in your family - it is how oral history works. MyOrigins keeps a clear line between what has been confirmed against a real source and what has only ever been relayed by word of mouth.
When a fact is tagged as family tradition, it means exactly that: someone told it to us, and we have not yet found a document, record, or other primary source that backs it up. It might be completely true. It might be slightly off - a name misremembered, a place confused with a nearby town. Either way, it is worth recording, and it is worth treating differently than something a birth certificate confirms.
As research continues, some family traditions get upgraded to documented fact once a real source turns up. Others stay family tradition indefinitely, and that is fine too - not everything needs to be proven to be worth keeping.