No. Rey Mysterio and Sin Cara are not related to one another. They both hail from Mexico and are of latino descent. Hence, they both are shown as friends & partners in the WWE. Apart from their relationship inside the WWE, they do not have any relationships outside the WWE. On screen Mysterio was Sin Cara's mentor before both men got injured
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yes sin cara and Rey Mysterio are friends
yes
yes i think so. i think they announced that they were going to have sin cara vs rey mysterio at wrestle 29. they were supposed to face at wrestle mania 28 but they were out with injurys
rey myserio
No Rey isn't his dad he has a wife a son and a daughter the son is like 14,15 and the girl is like 10,11