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His great great grandfather. Add a 'great' for each successive generation.
All you have to do is add another great. To your son, they are a Great great grandfather. That is often abbreviated as 2g grandfather.
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What relation is your grandfathers sisters son to you?
cousin
What relation is your grandfathers nephews son to you?
3rd cousin
What relation is your great grandfathers dad to you?
Your great great grandfather.
What relation is your grandfathers nieces son to you?
Your grandfather's niece is a first cousin of one of your parents. Her son is your second cousin.
what is my 3rd great grandfathers brothers son to me?
What is your great-great-great grand nephew?!
Who invented the UK national lottery?
My great great second, half, brother in law who's great great grandfathers....son.
What relation to you is your grandfathers cousins son?
Your grandmother is first cousins with cousin. Your parent would be the second cousin of the cousin's son. That would make you second cousins once removed.
What is your nephew's son in relation to you?
Your nephew's son is your great nephew.
What is Relation of your son to your aunty?
Great aunty
What is your relation to your niece's son?
great nephew
What relation is your husband to your niece's son?
Your husband is great uncle to your niece's son (your great nephew).
What relation is your sister's son's son to you?
You would be a great uncle, so they would be your great nephew
