Tim Chester writes:

Made in the image of the Trinity as we are, human personhood is realized through relationships just as divine personhood is. The doctrine of the Trinity shows us that relationships are essential for personhood. A “person” is like a “mother” or a “son”. It has no meaning apart from relationships with other people. You cannot be a childless mother, a parentless son or a “relationless” person. What defines a mother is the fact that she had children. What defines a person is the fact they have relationships with other people . . . True identity is found in relationships. I find my identity as the husband of my wife, the father of my two daughters, a member of a Christian community, a child of God (Tim Chester, Delighting in the Trinity: Just why are Father, Son, and Spirit such good news?, 165).