The interviewers want to know that you would have the support required to sustain you through your heavy and challenging dental school workload and sustain your commitment through graduation emotionally and financially. Additionally, if members of your family are opposed to your pursuits in the field of dentistry, this can impede your success. There is also the aspect of financial support. Rather than focusing on these elements, focus on your family's pride in how far you've come. If someone in your family has experience in the field of dentistry, be sure to volunteer. The more things you have stacked in your favor, the more likely they will be to accept you into their programs.