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Other people--grandparents, sisters and brothers, the mother's best friend, the next-door neighbor--get to be familiar to the baby. If the mother communicates her trust in these people, the baby will regard them as delicious novelties. Anybody the mother trusts whom the baby sees often enough partakes a bit of the presence of the mother.

Louise J. Kaplan (1978). “Oneness and separateness: from infant to individual”, Touchstone
Other people--grandparents, sisters and brothers, the mother's best friend, the next-door neighbor--get to be familiar to the baby. If the mother communicates her trust in these people, the baby will regard them as