Siblings on the mother's side, in four years never read

Living Worlds' count of each mother's other children came within 0.28 on average of the brothers and sisters Americans report (full, half, step and adopted), against 0.51 for a frontier model answering from what it has read, and was closer in every year (0.21, 0.25, 0.28 and 0.38 against 0.43, 0.51, 0.53 and 0.55). Children ever had: 0.10 against 0.16. Registered before any sibling answer from 2004, 2008, 2012 or 2016 was read, with the engine unchanged; scored on 24 cells of the General Social Survey. Adding the father's side gives 0.47, still ahead of the model, and that side became the next test.