Question

I am very grateful to her for help(special-первый her) The doctor has been called by my son(special my son)

Answer 1

Who am I very greatful to for help.

Who has the doctor been called by.

Answer 2

It seems like you want to make these sentences more specific by adding a possessive pronoun ("my" and "her"). Here are the revised sentences:

1. "I am very grateful to her for her help."
2. "The doctor has been called by my son."