SanDiegogirl

Don't know the answer I'm afraid.... but one of the criteria of the Ancestry visa is that a grandparent must have been born in the US - so this grandparent born in Namibia would not qualify you for it.

Your ancestry

You must show that you have a grandparent born in one of the following circumstances:

• in the UK, the Channel Islands or the Isle of Man
• before 31 March 1922 in what is now Ireland
• on a ship or aircraft that was either registered in the UK or belonged to the UK government

BritInParis

South West Africa was a German colony until 1915 when it was captured by South Africa during WWI. It was then made a League of Nations Mandate territory administrated by South Africa. A separate South African citizenship wasn’t created until September 1949.

Do we know if your partner’s father holds a British or South African passport?

SanDiegogirl

Where was partner born and where was partner's father born?

nhs84

Partner: Birth: Windhoek, 15 Jan 1986
South African passport at birth and then got a Namibian passport after independence. But kept South African passport whilst living in South Africa and let his Namibian passport expires. Now lives in Australia and has an Australian passport too.

Father: Birth: 4 February 1958 - Gobabis, South West Africa (Namibia)
Namibian passport currently, but would have had a South African passport at his son's birth (my partners birth)

Grandfather: Birth: 29 July 1910, Keitsaub, Gobabis, South West Africa (Namibia)
Death: 17 June 1969 Gobabis, South West Africa (Namibia)