Margaret Westbrook Rodd, Cornelius Westbrook and Nancy Hance

What evidence do we have that Thursia, LeVega and Donzega's mother was Margaret Westbrook, daughter of Cornelius Westbrook and Nancy Hance?

Margaret Westbrook Photo of Thursia, LeVega and Donzega at https://picasaweb.google.com/lh/photo/6fdBd_xXs-pVpY6eh9hrndMTjNZET...

LeVega's burial lists Margaret Westbrook as his mother. http://www.geni.com/profile/6000000001440361041/events/600000000727...
His brother Gonzega also lists Margaret Westbrook as his mother: http://www.geni.com/profile/6000000007279143219/events/600000000727...

See discussion Margaret Westbrook Rodd, Cornelius Westbrook and Nancy Hance.