Final answer:
The best approach when closing an interview is to thank the individual and offer ongoing support by inviting them to contact your office if further assistance is needed.
Step-by-step explanation:
When closing an interview with a family member, the best way to offer further assistance is by letting them know they are welcome to reach out if they need more help. A considerate and professional approach would be to say something along the lines of, “Thank you so much for your time and the information you've shared. If you have any further questions or need additional assistance, please do not hesitate to call my office.” This approach conveys empathy, respects the individual's time, and provides an open channel for future communication. It's also important to ensure that you provide your contact details so the individual can get in touch easily.