recovery of APple ID
How to find an old Apple ID used to set up phones.
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Have you checked Settings on the phones to see if the ID shows anywhere such as Messages, FaceTime, iCloud...?
See if you can recover the ID/password. Use every email address you can think of.
Apple ID - How to find your Apple - An iCloud e-mail address is an Apple ID.
If you forgot the Apple ID (iCloud) password, enter the Apple (iCloud) ID, and click Forgot Password. See if you can get a Rescue or Notification email option if necessary. Link to contact Apple Support at the end of the 2nd article.