Default Need internal files off phone that is pattern locked

I realize this sounds sketchy. A family in my church lost a son in an accident last week. The parents are hoping to check the phone and get some sort of closure or understanding as to what was going on before he was in the accident. The phone is pattern locked and the family tried so many times that it's now asking for his gmail, which we don't know. So as of now we have a ZTE 9100 phone that is pattern locked and they would really love to get as much information off the phone as possible.. They do not want me factory resetting it.. I told them i'd assume we'd lose files/ pictures, etc doing that..

Any help would be appreciated.