[shirleyville]

Jim,
In my opinion, no response doesn't constitute a request for no contact -- especially since you asked this person to let you know if no further contact was desired. The burden of respecting the wishes of all involved falls on the one doing the searching -- if you contact someone and request information, or request contact, and they don't want to comply, then it is up to us to respect that -- but that doesn't mean that the person who receives the request has the right to disrespect US by just flat ignoring us altogether. IF, for some reason, this person isn't your sister and has received all of this in error, she should at least have the courtesy to contact you and let you know that you have the wrong person......if she IS your sister, and she can't cope with this, emotionally, she should at least let you know that, as well.
Is there a chance that she could be ill? Perhaps she isn't well and that is why her son was there, and signed for the letter. Perhaps she hasn't even been told, if she is in failing health for fear this is something she can't absorb it all right now. Even worse, but also a possibility, is that she might have passed away.
If I were you, I would try to make contact again.....just explain that you meant no harm or disrespect in attempting contact, but rather, you are only trying to reach out to a part of your past, in the hopes that you can move on with your future.
Best of luck! Keep us posted!
Sally