OK, I had a hard time understanding your post at first too...I thought it was difficult child's aunt that was in recovery, lol!
Well, I can see her aunt's point. You son, however, has made great strides. He has almost a year clean, and a year is the recommended amount of time that recovering addicts are supposed to give themselves before they attempt a relationship. Now I realize that difficult child has been with wingnut when less than a year sober, but at least he knows now what to run from...
They both need to take it slow and be very careful. My prayers are with you all! This could be such a good, healing thing.