So if Mary's parents married in the UK it seems unlikely they were Aboriginal, though not impossible they were Carribean or even African American... or perhaps Mr WELLS from Ohio was dark skinned?
By the way the term 'half caste' is considered very offensive in modern times. It generally was used to 'classify' Aboriginal Australians but also other indigenous people historically, and rarely with positive connotatations or consequences (e.g. a way of selecting which children to remove). An African American/white person was called 'mulatto' - again, not a particularly nice term.
'Mixed race' is also obsolete.
Biracial is probably a more acceptable term to use now. I appreciate you meant abosolutely no offence, but perhaps you can amend your post subject title and body?
