Only child libras vs. ones that have siblings

I know 4 libra girls, two of whom are only children, and two of whom have siblings. The ones that are only children seem to be very well adjusted, whereas the ones with siblings are all over the place. Does anyone know why that might be?

Hmmm - well, how about this...my "friend" (used loosely because we are having issues) had a brother about 4 years older. Both are Libras. Not sure how that affected each other.

I know both people and they are different characters. Brother is driven to make money and seems more decisive than your typical libra. My friend is tough and driven too, but seems to be more indecisive when things come up.