Re: [magic] spell to find members of a group of people?
Chop off a hand and cast Ancient History on it.
But more seriously, there's a branch of divination on examining a subject and answering questions about him. Sense Life can also be dialed in to a specific kind of life, family would make sense. Retrogression would make for great flavor if it followed bloodlines the way it does in Wheel of Time.
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