Translation:My sister had paid my mother.
Just a tip: the past participle (particípio passado) of 'pagar' can be both 'pagado' and 'pago'.
"Pagar" is a tricky verb because it can take a direct object, an indirect object or both. It can even take two indirect objects. It has puzzled me in the past:
Even native speakers seem to stumble over it a bit:
But, one thing that Anderlc says in that discussion is relevant here:
What I can surely tell you is that, when you're using "pagar" with the meaning of "paying someone", you must use the preposition "a".
That's what I think it is here.
thhy does the 'a' have to be used here, when it is usually omitted in hhe sentences we practise?