Dead or Alive? Knowledge about a Sibling’s Death Varies by Genetic Relatedness in a Modern Society

From the book : Evolutionary Psychology 7 issue 1 : 57-65.
Using a large sample of non-institutionalized individuals from the Netherlands (n 7610), we examined the influence of relatedness on an individual’s knowledge about whether their sibling is alive or not.
Respondents were generally less likely to know whether their sibling was alive if they were not fully related.
The effects were stronger for differences between paternal half-siblings and full siblings than for differences between maternal half-siblings and full siblings.