You can't get object's name.
You should do this with instance variables. Create an instance variable on the family - it could be "objectName" or "audioName".
Set the correct value to this instance variable for each text instance.
Then on tap simply play audio file FamilyTexts.audioName
Also, I thought you have a family with multiple text objects?
On you screenshot I see only one text object - txt_session. If you want these events to be universal (to work with all text objects), you need to replace txt_session with family name.