O devises to A for life, remainder to A's children and their heirs. Assume that at O's death (which was at the time of creation), A is living and has only one child, B. In this case, A has a [[wex:possessory_estate|present possessory]] [[wex:life_estate|life estate]] and B has a vested remainder subject to open because A could still have more children. O doesn't retain anything.
Subject to open
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