My identical twin sister had her baby at 35 weeks pregnant and I have forgiven her for the way she reacted ...?

to me being pregnant with twins I am 21 weeks pregnant we are both 19 years old. But as I was the first person to see nikki and her husband Leon me and my boyfriend realised that mine and nikki's mum and dad would cone next. As soon as they came to see how nikki and evie are. They requested that I should leave in a rather rude manner but nikki stook up for me and said I should stay regardless as we are identical twin sisters we stay together. But I stayed for a while than left as I was getting stressed and I didn't want to damage my babies. Today I went back to pick them up and take them home and my mum and dad swore at me and threatened me. What can I do to stop that??? And secondly what can I do to make the family close??? after they hadn't seen me in 5 years.