Student or Learner
Is it correct the following sentence?
She is the daughter from the family his father keeps business with.
'is in business with' / 'does business with' / 'has business with' / 'has business dealing with'
She is the daughter of the family with which his father is in business.
And, secondly, I just can't be sure if it is correct to use which, since it is not used for people.
Thanks for your answers in advance.