Ambiguity of they
Is 'they' ambiguous in the following text?
It shall be so that House Telfour shall agree into the following contract with House Sovern. That they shall give up all their goods and assets for our keeping and do with as we wish for the price of one diamond ring. That Billi Buffs shall have the right of this but must not go back on the contract once it is spoken before the council.
I think this creates an ambiguity on which house gets the goods and assets but am not sure. IF it is not ambiguous, is there any way to make it so?