If they ask you questions, be honest w/your answers...but you don't have to go over board in responding. You can also advise them that what you are telling them may have come from your son, etc., i.e., that you didn't witness the behavior of the om.
As for your social security number...you were smart in not giving that out. If they need it later, they can ask for it in person and explain why they require it.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.