While 8.30 pm is an odd bedtime, unless unusual work start time requires a very early night, this might be the reason your sister asked you over at 8.30, expecting her husband to be in bed by the time you arrived. I would leave it a few days and then ring your sister to diplomatically check she is ok, and to finish off the conversation. You can ring at a time when her husband is in bed or when he is at work. As others say, her husband may be controlling but you probably need to wait until your sister opens up. I stayed in a controlling relationship for years which limited my contact with my family. As my family were unaware of any issues, they thought I was the one being aloof with them, but my ex used to listen in on phone calls so it was difficult to talk other than about general things. I eventually realised I had become an enabler of the controls on what I could do. I did eventually manage to leave but it was very difficult and may not be an option for everyone. I am however more in touch, mainly in the phone, with my family than before.