Creates the department of children, youth, and families.

Creates the office of innovation, alignment, and accountability, within the department of children, youth, and families, with the primary duties and focus, until July 1, 2018, on developing and presenting a plan for the establishment of the department of children, youth, and families.

Requires the office of the family and children's ombuds to establish the oversight board for children, youth, and families which will begin its work on or after July 1, 2019.

Abolishes the department of early learning and transfers its powers, duties, and functions to the department of children, youth, and families.

Transfers the powers, duties, and functions of the department of social and health services, pertaining to child welfare services under chapters 13.34, 13.36, 13.38, 13.50, 13.60, 13.64, 26.33, 26.44, 74.13, 74.13A, 74.14B, 74.14C, and 74.15 RCW, to the department of children, youth, and families.

Transfers the powers, duties, and functions of the department of social and health services, pertaining to juvenile justice services under chapters 13.04, 13.06, 13.16, 13.40, 28A.190, 28A.225, 74.14A, 72.01, 72.05, 72.09, 72.19, 71.34, and 72.72 RCW, to the department of children, youth, and families.

Requires the oversight board for children, youth, and families to, from July 1, 2018, through June 30, 2019, assume the duties of the legislative children's oversight committee.