Who has kids/grand kids with ADHD?

For whatever the reason my step daughter stopped speaking with me several years back. When I asked my wife what was going on that she did so I was told that her kids are her problem not mine and that I need to mind my own business. So I respected her wishes.

Few days back my wife told me that her daughter, who has 4 boys, pretty sure they are 2 sets of twins is having a problem. The older twins have been acting up in school. Stopped studying. They have become unruly and are starting trouble. She had a rough pregnancy with these two boys. For the longest time there was a fear of them having a developmental issue. Don't remember the specifics but they were very slow in learning to walk, talk. When they did talk they would only talk with each other. They would very rarely talk with either of the moms (Wifes daughter is a Lesbian).

Fast forward to a few days ago, Ernie mentioned that the twins are having trouble. They were at a doctors office where ADHD was mentioned. When I was seeing my shrink in AZ he asked if I had ever been tested/diagnosed for ADHD. He told me that the thinking, at the current time, was that children with ADHD often end up being Bi-polar adults.

So, my question to any members whose children/grand children had ADHD as a child...what happened when they grew up? Any mental health issues?

My shrink back then told me that there was a reason children were never diagnosed with Bi-polar, had something to with what was accepted by the folks who wrote the DSM or whatever that book is called.

Apologies for rambling, been a rough few days and I am in a bit of a fog...

Thanks for any and all thoughts/comments.