Newly married with two step daughters age 17 and 19.  I have a functional special needs biological daughter age 14. I have full custody of my daughter. We all got along until my husband and I got married and bought a new house. I sold my condo to buy this new house. When it came time to move in the older daughter came unhinged when she could not bring her pot smoking boyfriend to live with us. She stole my daughter's emotional support dog and said she was going to kill herself if we took it back.  Then the 17 yr old SD decided she's going to take this dog too.