Age Gaps?

My parents have twelve children including three sets of twins. I have one older sister who is 30, then me and my twin brother, we are 29 and I am older, another sister who is 26 this year, another brother who is 24, another sister who is 22 this year, twin sisters who are 21 this year, another brother who is 18, another sister who is 15, another sister who is 14 and twin boy and girl who are 10 next month. Regardless of our big age gaps, we were/are all close and talk often