Obeying the husband and asking his permission to go out
Obeying your husband and asking his permission to visit your sister is obligatory. You should convince him in a nice way; if he persists, you have to obey him, for obeying him is obligatory upon you, and you will not be held accountable for not visiting your sister. May Allah grant us success. May peace and blessings be upon our Prophet, his family and Companions.