Has anyone had a family member write a letter to help get disability?

with my case they sent out what they call funchion reports to those i listed. i know my sister was very fustrated filling it ot case the answer to the questions were yes and no and she knew that with some of the questions the answer was sometimes but that wasnt a choice and u couldnt leave a comment explianing anything so she wrote a letter explaining some of the things where the answer should of been sometimes i could do that thing and other days i couldnt she didnt want to lie and put no but she felt that if she just left certian questions yes i would get denied so the letter explained each queston that she felt there should have been room to explain