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Depends on how you want to analyse the question.

The House of Windsor is a fiction created during George V's reign, namely during WW1.

Hannoverian Victoria married Wettin prince Albert of Saxe-Coburg-Gotha.
Their elder son, Edward VII, who reigned as Edward of SCG, married Alexandra of Denmark.
The Royal House of Denmark is a branch of the Schleswig-Holstein-Sonderburg-Glucksburg house, itself, a branch of the Oldenburg house.
Sounds pretty german, doesn´t it ?
Their son, G.V married Mary of Teck, a member of a junior branch of the house of Wurttemberg.
Shouldn't there have not been a war, the dynasty might remain of Saxe-Coburg-Gotha.
Followed G. VI, who indeed married the "scottish lass" Elizabeth Bowes-Lyon.
Then came Elizabeth II, who married Philip of Greece and Denmark, from the S-H-S-Glucksburg i.e. an Oldenburg again.
Philip's parents were of pretty german ascendance too, Andrew of Greece and Alice of Battenberg (from the house of Hesse-Darmstadt)

So, you could say that Charles III has 3/4 of germanesque blood and 1/4 of scottish blood.

Which will probably irritate the british who consider the BRF is ... british .