About the Sibling Leadership Network (SLN) Established in 2007, the Sibling Leadership Network (SLN) is a national nonprofit with state chapters that is dedicated to providing information and support to siblings of people with disabilities throughout the lifespan. Follow SLN on social media: Facebook; Twitter feed; and Instagram. SLN Sibposium – Wednesday, April 27, 2022 read more April 27th SLN Sibposium and Resources for Adult Sibs of People with Disabilities