You all have really good stories , now that I'm 16 - 17 , I wish I had a younger brother to teach him about aspects of life and music in general, same as my brother did when he had the age that I am right now.
Step siblings from my father: I have a step sister that I don't know but she's 25. A little sister at 8 and two more that are twins but I don't know their ages.
In my house we're all a year or two apart. My oldest sister is 19 (she's in college), I'm the second oldest at 18, a brother at 17, a brother and sister a few months apart at 14 & 15.
I have one half-brother than I know of and I think I have more but I don't have any contact with my Father or his side of the family so I'm technically an only child.
It's not actually fun to be an only child, especially when you live in the middle of nowhere, can get pretty lonely when you are younger.