President Biden has said he wants to increase the benefits in a federal program for low-income children and adults with disabilities. But a long-running debate about the program is whether the direct cash assistance helps children when they grow up. The Supplemental Security Income program, or SSI, clearly has immediate benefits. SSI provides nearly $800 in monthly cash payments and Medicaid health insurance to help parents care for their children and teenagers and manage their physical, cognitive, or behavioral disabilities. However, policy experts disagree on the program’s long-term effects. Critics say it creates a negative dynamic if it causes poor parents, consciously or unconsciously, to lower their expectations for a child in order to preserve the payments. If the child…