Six relatives
In Liuyao, the six relatives are a set of relationship categories used to describe the role a line is playing in the reading. They are interpretive roles, not proof that the reading is always about literal family members.
English translations vary, but beginners often meet labels such as parents, officials/ghosts, brothers, wife/wealth, children/grandchildren. The important thing is what kind of function the line is taking inside the question.
For example, a line associated with wealth may matter in money questions, but the same category can also point to resources, desire, or what is being sought. Context matters more than mechanically forcing one keyword.
That is why Yarrow treats specialist terms as support, not as a substitute for reading the whole pattern.