I have 3 biological children (23,10,2) and 3 step children(18,16,9), my two oldest children are from a previous relationship. His two oldest children are from a previous relationship. A year after we got married he was contacted about his child in foster care, and this is how we found out about his 3rd child SD9 and we share our youngest who is 2. The same month I gave birth to our youngest, we got full custody of SD9...everything was great and going smoothly, then it’s like a light switch turned on about 6-9   Months ago SD9 turned into a complete lying, manipulative A-hole!