"what age is her grandson" also should be accepted.
Yes. That's what I put also.
I wrote down: How old is her grandson has.:(
Porque al poner is y has en la oración has escrito dos veces tiene
I've never heard anyone talk about age that way in Spanish. I would say "Cuántos años tiene su nieto". But I'm not native to Spanish. Can anyone else say with more certainty?
Sorry, im still learning english so my vocabulary isn't big
You are right. We dont say "cuantos años tiene el nieto de ella" we just say " cuantos años tiene su nieto" cause in spanish, Her and his mean the same : "su".