This is a research study investigating nutritional assessment (as reported by parents and family caregivers) in patients with Zellweger spectrum disorder (ZSD) and related peroxisomal disorders. This study is being conducted by Dr. Mousumi Bose, Assistant Professor in the Department of Nutrition and Food Studies at Montclair State University. This study will be conducted over a 3-month period. Parents and family caregivers of children with ZSD or related peroxisomal disorders interested in participating will be asked to participate in a survey that will ask about demographic information (such as age, gender, etc) and how their child is fed. If you are 18 years of age or older and you are a parent, legal guardian, or family caregiver to a child (age 1 year or older) living with ZSD or a related peroxisomal disorder, you may be eligible to participate. If your child is currently breastfeeding or on total parenteral nutrition, you are ineligible to participate in this study at this time.