One phone in my chat group sends iMessages when one member is Android

Tried everything, and then the solution was this: the Android person in the group, who’s phone number was formerly with an iPhone, had to “deregister” her phone number as a number that received iMessages. The Android person deregistered her phone number as an iMessage number both online and by using her old iPhone, which she still possessed, but was not using (nor was it connected to a cellular network). Once she did that, the iMessaging iPhone recognized the now-Android/formerly iPhone phone number as Android, and it showed “Text” in its text box instead of “iMessage.” This then kept all texts by all group members as SMS text messages instead of anyone’s iPhone replying to the group as in iMessage (which split the responses into two streams). Here’s the Apple site and instructions for deregistering one’s now-Android phone number from iMessage: Deregister and Turn Off iMessage - Apple Support.

So, again the key is the new Android person deregistering their formerly iPhone phone number as a number that receives iMessages, per the website above.

Thanks. Still sends to the group as an iMessage. Thanks for trying. I appreciate it!