The Code of Ethics of the Association of Professional Genealogists promotes the communication of coherent, clear, and well-organised information). It is not that simple when adoption features in a family’s history. This paper suggests that standard approaches to family tree-construction will struggle to capture the complexities, gaps, and challenges posed by adoption. Firstly, the paper makes the case for family historians having an alertness to adoption by noting the number of people affected by adoption. It then goes on to look at the literature that argues that adoption involves erasures of birth families and makes ghosts of them. Adoption also creates possible selves and lives; the adopted person’s “could-have-beens” had there been no adoption, the biological child that the adoptive parents might have had and could not, the birth mother’s life with the child lost to adoption. These presences and possibilities haunt all involved in adoption, and writers have posited the existence of a “ghost kingdom”. This paper maps out a greater ghost world of adoption, paradoxically full of life, and because of access to birth records, a world that offers a much greater potential for materialisation. The paper avoids the traditional notions of ghosts as things to be shunned or as representatives of pathologies. Instead, it asks for respect for the “not-dead”/“not-past” of adoption and for family history researchers, a capacity to embrace the jumbled, the murky, and the disorganised. People everywhere are increasingly constructing their own family trees, with all the potential for pleasant surprise but also the shock that this might bring. Should genealogists overlook adoption’s ghosts then they overlook the opportunity to professionally map a rich and varied world of family knowledge and connections. The paper concludes with this observation coupled with a discussion of other associated ethical implications of family history work where adoption features.