This has occured with my mother and her siblings and I also see it in my childs father.

My mom has six siblings, making 3 girls and three boys. All the men are struggling heavely, only one male graduated highschool. None are in college, on is on drugs and the other two no one is sure about. One uncle I haven't seen since age 8 and no one is sure he's even alive. All three have children they barely or don't care for. None have a stable home or life for that matter.
Also one is in jail.

As for my mom and her sisters, two sisters own their own homes, have cars, steady jobs, good credit, have raised their children as well as others, and provide for their mother and father if needed. One sister(the oldest) was mentally ill and died of breast cancer.

And anytime I talk to my aunt the first thing she says is that my grandmother loved her sons and raised her daughters, and my mother agrees.

I'll be back in sec.