if someone cannot understand “what is your address” and “what is your date of birth”, or you have trouble understanding their responses, or the patient requests an interpreter (this is their right
2) ) - you need an interpreter and using a family member has limitations (eg. privacy barriers, and juveniles may lack the understanding needing, and this may have lethal consequences) and is not as good as using a 3rd party interpreter (preferably an accredited one)