The study, by sociologists at Indiana University Bloomington and the University of Connecticut, found that two-parent adoptive families not only spend more money on their children, but also invest more time, such as reading to them, talking with their children about their problems or eating meals together.

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In general, the two-parent adoptive families were older and wealthier than biological parents, single parents and step-parents, but even when financial resources were taken into consideration, the investments by adoptive parents still showed an advantage.

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