Trust Based Relational Intervention (TBRI) was pioneered by the late Dr. Karyn Purvis. The therapeutic parenting process is a specific way to parent a child with attachment issues. It’s where you use your child’s behavior to clue you in about what’s going on in their brain. Depending on your child’s history, using therapeutic parenting to help a child with attachment issues will take between six months to two years of continual repetitive intervention.