"I'm going home to take care of your siblings", Mr. King said, referring to his two other dogs and a cat.

(译文：“我要回家照顾你的兄弟姐妹们，”沃恩·金说，他指的是他家另外两只狗和一只猫。)referring to his two other dogs and a cat.这是siblings的同位语从句吗？请老师把它还原完整并分析一下作什么的句子成份？