Oh, the all-american family. My sister on the right, my ex-step-half-brother on the left. See, my mom & dad had me, then divorced. So he married a 19-year-old and had two more daughters. Recently they divorced, she got re-married and had a baby (above), and he married a 26-year-old (I'm 23). Now they're having a baby. I'm an only child, a middle child, a step-child (redheaded to boot), a biggest sister, a littlest sister, and a half-sister, and soon my son will have an uncle or aunt 7 years younger than him. What fun! (x-processed Fuji 64T from my Diana)
I love these greens and reds. I am still a little confused about your family tree, but I think I need some coffee before I tackle that subject again :-) I also like the setup with your sister watching the boy, and the boy watching you (us). It creates a triangle of observation that I find interesting.