Relationship websites, speed dating events, and advertisements offer new possibilities for establishing a family for individuals seeking sperm or egg donors or co-parents for their future children. Users of these media platforms create their own agreements regarding conception and the upbringing of the child. This can result in various types of agreements. This research aims to provide insight into the structure of these new families and the different types of co-parenting relationships that emerge. We will analyze the criteria for parenthood (what defines a person as a parent?) and develop new concepts for parenthood in relation to associated parental responsibilities. This research will contribute to a coherent framework of principles and theories related to parenthood (and how parenthood can be a subject of negotiation). This contribution will be realized through a literature review and a normative analysis, informed by an interview study with users of these websites and speed dates.