Without stating the obvioius, he needs a parenting plan. I assume this is a paternity case, i.e. the father and mother were never married. If his name appears on the birth certificate and/or he has filed an acknowledgement of paternity, he can file a "Petition for Establishment of Parenting Plan". The forms are on the Washington State Court website. However, I strongly advise him to retain an attorney who is familiar with family law in the county where he resides. Once he has a parenting plan, the mother cannot refuse to allow him to see his daughter or she is subject to a contempt of court motion. This is the best way to proceed.