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We identify the social relationships between individuals in consumer photos. Consumer photos generally do not contain a random gathering of strangers but rather groups of friends and families. Detecting and identifying these relationships are important steps towards understanding consumer image collections. Similar to the approach that a human might use, we use a rule-based system to quantify the domain knowledge (e.g. children tend to be photographed more often than adults; parents tend to appear with their kids). The weight of each rule reflects its importance in the overall prediction model. Learning and inference are based on a sound mathematical formulation using the theory developed in the area of statistical relational models. In particular, we use the language called Markov Logic . We evaluate our model using cross validation on a set of about 4500 photos collected from 13 different users. Our experiments show the potential of our approach by improving the accuracy (as well as other statistical measures) over a set of two different relationship prediction tasks when compared with different baselines. We conclude with directions for future work.