My biofather wasn't very involved with us growing up. A few visits per year, he did pay child support regularly. He was remarried a couple of times and with wife #3 had two more girls. We lost touch with them all. My sister's home number is the only one they had. She just got a message from the younger girl. I called her back and left a message. Just so unexpected. We have no interest in getting back in touch with our biodad, nor with rehashing anything from the past. But we are willing to meet her and our other half-sister. It will be interesting to see why she called.