I think the issue here is that your husband is acting in an unjustly authoritarian fashion, treating your mutual home as "his alone" by forbidding you, an adult woman, from allowing your sister to visit you in your own home. I'm afraid this problem really has nothing to do with your sister and her "marriage." It has to do with your husband's approach to your own marital relationship and your own apparent tentativeness about making clear to him that he is acting inappropriately toward you. I can only recommend that you speak with a marriage counselor, preferably with your husband but on your own if necessary. Please contact the Pastoral Solutions Institute
, a Catholic counseling apostolate, for personalized assistance.