ABSTRACT Through supplemental work on the parent R01, this project aims to provide research training, mentorship, and career development opportunities to build the early career of an emerging Latina clinician-researcher and increase monolingual Spanish speaking Latinx community participation in clinical trials for neurodevelopmental disorders. Engaging underserved communities in clinical trials is challenging. Even when rehabilitation research is stakeholder- informed from design to enactment, it does not always allow minority groups to access certain studies. People of Latin American origins in the United States (US) are growing minority group, who are at high-risk for marginalization in the healthcare system and in research. For Latinx children and families with CP, marginalization can occur due to the intersection of socio- demographic obstacles, language, and culture. As a result, they may experience poor health outcomes that compound over time and further impede participation in clinical research evaluating the acceptability and effectiveness of interventions for CP. Yet, if this challenge can be addressed, it would significantly improve the generalizability of interventions for CP that engage parents as active participants in research and healthcare managers for their children. Towards this end, the current supplement evaluates the hypothesis that culturally appropriate adaptations of motor and parenting interventions from the parent R01 will increase enrollment of a geographically representative sample of US Latinx children with CP in the parent R01. Two specific aims are proposed. Aim 1: Two-year enrollment of a geographically representative sample of Latinx children with CP in the parent R01 will increase when culturally appropriate translations and adaptation of materials are used and improve understanding of caregiver perceptions surrounding early CP diagnosis. Aim 2: The effect of each intervention when delivered in Spanish (appropriately adapted for cultural norms) to Latinx families will not differ relative to English in English-speaking families matched for social determinants of health. The data collected in the proposed supplement will improve access of US Latinx families to clinical research interventions and inform approaches to enhance research participation in neurodevelopmental disorder related clinical trials. The proposed supplement will also provide insight into caregiver perceptions of early diagnosis that may inform clinical care.