The proposed project is an intervention development grant in which the investigators will develop a program to facilitate the engagement of adult siblings to work with their families to plan for the future of their brother or sister with autism spectrum disorder (ASD). Siblings FORWARD (Focusing on Relationships, Well-being, and Responsibility aheaD) will target common barriers to sibling involvement in family future planning, including improving family communication around difficult topics, increasing siblings' knowledge of and confidence in accessing ASD service systems, and anticipating and proactively problem-solving barriers to future planning. Siblings FORWARD will be implemented in a community setting. There are three aims of the project, and only the third aim will utilize a clinical trial. Aim 1: To develop the Siblings FORWARD program. The investigators will develop the Siblings FORWARD program in collaboration with community organizations, with input from siblings, adults with ASD, and community providers. Aim 2: To assess feasibility of the Siblings FORWARD program. The investigators will assess recruitment capability, appropriateness of outcome measures, acceptability of the program, and viability of the procedures and further refine the Siblings FORWARD Program through an open trial with 5 siblings. Aim 3: To assess the outcomes of participation in the Siblings FORWARD program. The investigators will conduct a pilot randomized controlled trial (RCT) with 36 siblings. The investigators will collect pre-, post-, and 3-month follow up data measuring intervention targets (problem-solving skills, communication skills, self-efficacy, perceived barriers to future planning, knowledge of services & delivery systems, knowledge of family plans), sibling behavioral outcomes (development & implementation of a sibling future plan of action, increased family communication around future planning), and proximal outcomes for the adult with ASD (unmet needs, quality of life, and family relationships). Siblings will be randomly assigned to the Siblings FORWARD (N=18) or an information only control condition (N=18). The investigators hypothesize that siblings who participate in the Siblings FORWARD program will have a more developed plan of action, gains in skills and knowledge, and improved proximal outcomes for the adult with ASD, compared to siblings in the control condition.