Possible unauthorized access and "shadowing" on my Google account via RTC

[UnartificiaLiNT]

Hi everyone,

I'm experiencing some strange issues with my Google account and I'm hoping someone can help. I'm concerned that someone else might have accessed my account and is "shadowing" my activity, possibly through the RTC (Real-Time Communications) features. Here's what I've noticed:

 * Unexplained device in Family Space: I created a Family Space and a device I didn't add appeared in it.

 * Screenshots appearing on a different device: Screenshots taken on one phone with no internet access showed up on another device when it came online.

 * No record of suspicious activity: I've checked my Google Activity but found no record of these events.

I'm concerned that someone may have access to my account and is monitoring my activity without my knowledge, potentially using RTC features to mirror or redirect data. RTC protocols often bypass standard logging and activity tracking, which could explain why I don't see any record of this in my Google Activity.

I've already tried:

 * Changing my Google account password.

 * Checking my Google Activity for suspicious logins or activity.

Has anyone else experienced something similar or have any suggestions on what to do?

Thanks in advance for any help!