Obtain the claimant's statement about the nature and frequency of the personal services
he/she performs and whether or to what extent the claimant's presence is required
because of the child's disability. Also, get a similar statement from the physically
disabled child. You may obtain these statements while developing evidence of the child's
disability. Development in the file on the child's disability may also contribute
information relevant to a determination of the claimant's performance of personal
services. If there is any question, obtain statements from others living in the household
or from other persons who have knowledge of the circumstances.