people connected to this person by kinship or by an overlap-implying affiliation, with those ties, for the "who could have been alive at the same time" view

everything the "who could have been alive at the same time" view needs for one person: the people connected to them through kinship or through an affiliation that implies overlapping lifetimes, and those ties themselves. The timing reasoning is done client-side (contemporaries.js) because it depends on assumptions the viewer can change (maximum lifespan, minimum parent age).