I still mean what the title says but I resolved the situation. How I did this:- I went up to my sister, stroked her hair and told her that even though I disagree it doesnt mean I don’t care about her and that its perfectly normal for people to differ and argue. My mum chimed in and told her its okay to have different viewpoints. She was a little reluctant at first and now immediately happier again.
I do still feel that I have a right to give my opinion, to argue, to disagree and still have my relationships without feeling guilt.