I was asked this twice this week! And one of the times I only had 4 of the kiddos with me!
Besides the twice asked "Are they all yours?" I was also asked another common question by someone else "How do you do it?" Honestly, sometimes I'm not sure! But I can say that having 5 kids under 10 and homeschooling has pushed me to new levels of organization and spirituality...so there are blessings!