(Put one parent's name in each column and fill out when the children will be with that parent for holidays and school breaks.) Page 8. Use this form to ask for a Parenting Plan, Residential Schedule or Child Support Order only if parentage has already been established by:.Try using Washington Forms Online. Washington Forms Online helps people fill out family law forms on a computer. The plan ends the second your daughter turns 18. At age 18 your daughter is an adult and neither parent can legally make her do anything. You can file a petition for child custody in your county's Superior Court. If you are divorcing, the petition will be included in your divorce papers. Petition for (Custody) (Visitation). The duty of the judge in all such cases shall be to exercise discretion to look to and determine solely what is for the best interest of the child.