I'm an only child!
As a kid I always wanted a younger sister to play with. As an adult, it doesn't really bother me because I've surrounded myself with friends who fill that role in my life.
I've been an only child my whole life until my mom gave birth to my little sister last year! She's now a bit more than one year old, and it's weird to think about our age gap! (17 years!!) I really liked being an only child, and now that I'm an adult I don't care about my mom caring "more" about my sister than me, you know.