This research examined the nature of closeness, liking, and love among 59 dyads of full biological, nontwin adult brothers and the correlations of these variables with age. Five dimensions of relational development were measured and used in stepwise regressions to determine what predicted closeness, liking, and love in these fraternal dyads. It was expected that love would be predicted by expressive relational qualities, such as self-disclosure, whereas closeness and liking would be predicted by more instrumental qualities, such as commitment or interdependence. These predictions were generally supported. Moreover, liking and love were shown to remain relatively constant over time, whereas closeness decreased as brothers grew older. Comparisons with other male-male relationships were also made, and implications for the research and therapeutic setting are offered.
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