Can stuttering be caused by ADHD?

Can stuttering be caused by ADHD? I think I have undiagnosed ADHD and for the longest time, I thought my stutter was caused by ADHD. I’m sure I have ADHD because I easily forget things. I can place something somewhere and the next minute I’ll forget where I placed it. And I try to talk soooo fast and many people never understand me. Also, could my stutter be genetic? Both my grandparents stutters but not really in conversations and only when they are highly emotional. I have a twin brother and he says he talk pretty fluently in public while I will stumble upon my words a lot. My twin and I aren’t alway together and I notice that I talk fluently when we are together. However, when we are not together in public, I stutter.