Financial planners working with clients on estate planning have had a new challenge put to them in recent years: how to advise a family where one or both parents have remarried and have children by both marriages, sometimes called a "split-level" family, The Wall Street Journal reports.

Some parents may be inclined to leave all or most of their estate to their current spouse because of the unlimited marital deduction for bequests to spouses. On the one hand, that's good, particularly if there is a child by that marriage who will need a college savings fund.

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