This report presents the findings from an evaluation of Jumpstart's Foster Grandparent Program (JFG) in Los Angeles and Compton, California, which operated from fall 2011 to summer 2019, where Jumpstart's services were delivered by older adults. The evaluation, which focuses on the 2017-2018 academic year, examines whether the JFG program was implemented as intended and to what extent the presence of volunteers enhanced children's educational and developmental experience in the classroom. The evaluation also explores whether the JFG program model shows promise for improving children's language and literacy and social-emotional development, which includes children's expression and management of emotions, as well as the ability to establish positive and rewarding relationships with others (that is, interpersonal skills). The Corporation for National and Community Service (CNCS) funded the evaluation. (author abstract)