Wakȟáŋyeža (Little Holy One)

Change in caregiver trauma symptoms will be self-reported using the Post-traumatic stress disorder (PTSD) checklist for the Diagnostic and Statistical Manual of Mental Disorders (DSM) -5 (PTSD Checklist for DSM-5, Civilian Version). This is a 20-item questionnaire. Scores range from 0-80. When used clinically a score of 33 or above indicates further assessment is needed.

Caregiver change in stress symptoms; Self-report that measures three domains of parenting stress: parental distress, parent-child dysfunctional interaction, and difficulty with child. 36-item questionnaire. Scores range from 36-180. Score ranges are represented as percentiles; 15-80 is considered a typical stress percentile, 81-89 is considered a high stress percentile, and 90-100 is considered a clinically significant stress percentile.

The Center for Epidemiologic Studies Depression Scale (CESD-R-10) is comprised of 10 items based on DSM-IV diagnostic criteria for Major Depressive Disorder. Scores range of 0-30, with a score greater than eight indicate clinically significant symptoms. The CESD-R-10 is based on the CESD, a widely validated instrument, including among Native American populations.

The Stressful Life Events Screening Questionnaire (SLESQ) is a 13-item self-report questionnaire designed to assess lifetime exposure to potentially traumatic events. It has been used in several culturally diverse settings and is recommended for use for research purposes.

Parents' positive childhood experiences will be measured by self-report at baseline with the Benevolent Childhood Experiences Scale. This is a 10-item scale designed to assess positive childhood experiences in adults with experience of mistreatment or adversity.

Parents' ACEs will be measured by self-report at baseline with a 23-item ACEs scale adapted to the study population.

Parenting practices will be measured by the Parenting Practices Interview (PPI), a 72-item self-report questionnaire adapted from the Oregon Social Learning Center's Discipline Questionnaire and revised for young children. It measures the disciplinary style of a parent and has been used in a variety of settings and populations.

Parental control will be measured by the Parental Locus of Control Scale (PLOC), a 47-item questionnaire which measures five factors to assess the locus of control a parent or caregiver has over a child.

Family routines will be measured via self-report using the Family Routines Index, a 28-item questionnaire which measures 10 areas of family routines

Parent substance use will be measured via self-report using an adapted version of the 15-item World Health Organization (WHO) ASSIST Questionnaire, which screens for problematic or risky substance use. A risk score is provided for each of the 10 substances included in the survey. The ASSIST is reliable, valid, flexible, comprehensive, and cross-culturally relevant having been validated with populations all over the world.

Parent historical loss experiences will be assessed via self-report at baseline with the Historical Loss Scale. The scale quantifies 12 types of losses that Native American tribes might have experienced in the past, how often they are thought about in the present, and 12 different symptoms that they might have because of thinking about these losses. This scale has been used in previous studies and in several Native American populations.

Parent communal mastery will be measured via self-report using the 10-item Communal Mastery Scale, which was developed specifically for Native contexts using two commonly employed measures of mastery and self-efficacy and adapted to add more collectivist statements. This scale was successfully used in a previous study at Fort Peck.

Parent tribal identity will be assessed using a modified version of the 6-item Orthogonal Cultural Identification Scale. The scale has been adapted for Assiniboine and Sioux tribal identity and was also used in a previous study on the Fort Peck Reservation.

Parents' experiences related to historical trauma will be measured by the Historical Trauma Checklist. This measure is a 15-item checklist, developed from focus group discussions with the Fort Peck Reservation. Three questions are posed to determine relevant historical trauma experiences.

Parent stress will be measured using the Perceived Stress Scale (PSS). The PSS is a 10-item scale that has been widely used and validated, including in Native American populations.

Social networks information will be collected via a 17-item self-report Caregiver Ego Networks Questionnaire. Parents will provide information about tribal affiliation, relationships, substance use, communication, parenting support, and cultural involvement of up to 10 of their closest social relationships.

Suicide risk will be measured with six items from the Columbia Suicide Severity Rating Scale (CSSR-S), which has been widely used to identify and assess individuals at risk for suicide across diverse communities and settings.

The Strengths and Difficulties Questionnaire (SDQ) and impact supplement will measure childrens' externalization and internalization of symptoms via parent report. The SDQ is a 30-item scale which measures 25 attributes on five scales: emotional symptoms, conduct problems, hyperactivity/inattention, peer relationship problems, and prosocial behavior.

Head Start school attendance will be tracked via teacher report on an ongoing basis for all children enrolled in the study.