Modern scholarship tends to see the genealogies of Jesus as theological constructs rather than factual history: family pedigrees would not usually have been available for non-priestly families, and the contradictions between the two lists are seen as clear evidence that these were not based on genealogical records. Additionally, the use of titles such as 'Son of God' and 'Son of David' are seen as evidence that they do not come from the earliest Gospel traditions. Raymond E. Brown says the genealogies "tell us nothing certain about his grandparents or his great-grand-parents". Marcus Borg and John Dominic Crossan contend that both genealogies are inventions to support Messianic claims.