It was said somewhere (Character Material I think) that during the 3rd Grail War, the Tohsaka candidate beat the Edelfelt older or younger sister I think (can't remember). Either by them afterwards falling in love and Marrying the Tohsaka, or having her Thaumaturgical Crest stolen... The Edelfelt sister gave the Tohsakas the Gandr spells (which would explain why Rin can use it as well as Luvia).
So yeah, there's definitely a relationship between the Tohsakhas and the Edelfelt.
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