<Table> <Tr> <Th_colspan="2"> House of Windsor </Th> </Tr> <Tr> <Td_colspan="2"> </Td> </Tr> <Tr> <Th> Parent house </Th> <Td> Wettin → Saxe - Coburg and Gotha </Td> </Tr> <Tr> <Th> Country </Th> <Td> United Kingdom and the other Commonwealth realms </Td> </Tr> <Tr> <Th> Founded </Th> <Td> 17 July 1917; 100 years ago (1917 - 07 - 17) </Td> </Tr> <Tr> <Th> Founder </Th> <Td> George V </Td> </Tr> <Tr> <Th> Current head </Th> <Td> Elizabeth II </Td> </Tr> </Table> <Tr> <Th_colspan="2"> House of Windsor </Th> </Tr>

How long has the house of windsor been in power
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