This data set contains transcripts from 11 oral and 2 written interviews with adults who are autistic and/or who have autistic siblings. These interviews were used to inspire a play, as part of the thesis, but may also be of interest to sibling-disability researchers (particularly those interested in relationships where more than one sibling is neurodivergent/disabled). The data set also contains a videorecording of a July 2025 reading of the play text, and notes on feedback from that workshop. Feedback was gathered anonymously from a live audience, and pseudonymously from a virtual focus group of interview participants.