What would you do if you're from a old school culture and your partner's sister try to destroy your relationship?

Me from a place where elder people think it's bad to be in a relationship while in schools and colleges.

My girlfriend is 22 and she's a uni student. I'm 26 work, an engineer. Her parents and sister are against our relationship. Yeah can understand her parents backward thinking. But wtf is problem with her sister.

Her sis is just 24 and just got divorced. She asked her to block me in all social media and regularly check her mobile.

I guess things will be fine after her studies (2 years). What do you think about this? Should I stay calm until then?

What would you do if you're from a old school culture and your partner's sister try to destroy your relationship?
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