Only once has this happened that I'm aware of. The weeks before my sister's death things deteriorated for her very quickly, and it hit me that her death was imminent. I started grieving for her even before she was gone. In on particular session, the tears came and I just sobbed and sobbed as we talked about her. I realized T was repeatedly wiping his eyes during that session. At some point (maybe it was during that session but I can't quite remember), he told me about losing his cousin some 30 years ago very suddenly in a car accident. The were very close, as close as brothers, definitely closer than he and his own brother. My intense grief over losing my sister brought back those memories for him, and that is what was going on during that session for him. On occasion he comes back to that cousin as we talk about my sister. It is a shared understanding of that kind of intense grief that we have, and that reassures me that he truly empathizes with that kind of pain.