the online Dictionary thinks they are the same thing
great-aunt or great aunt (grtnt, -�nt)
n.
A sister of one's grandparent. Also called grand aunt.
n.
A sister of one's grandparent. Also called grand aunt.
Hope you have a Great weekend!
and that is Great for those who accept the changes but not so Grand for those who stick to the original term


or if you are up north it would be hen nain.... and your aunt is modryb or great aunt would be fodryb mawr, and grand is mawreddog but rarely used actually I think its easier in English.
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