how can I find a child account that I set up but can't remember the account information
I created a child account over a year ago, but I cannot remember the ID or password. How can I locate it?
There's not much to go on. Were any songs purchased with this account? I believe those have account information attached to them if you get info on a song and then summery.
Contact Apple for help with Apple ID account security - https://support.apple.com/HT204169 "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues."