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To answer directly, each parent while the child is with them has the right and the ability to control access. But until the courts set up specific rules on physical and legal custody, both you and your husband share co-equal rights. That means that he cannot limit your rights and you cannot limit his. It also means that until the courts change the conditions in some way, if your child is with the husband, nothing legally stops him from sharing his child with his sister. You'd need to obtain a restraining order coupled with a custodial decree limiting access for the sister for him to be bound by your desire to keep your child safe.