I would imagine that nearly ever sibling in the world has argued with their brother or sister at some point. So although you’re not alone in your struggles, the reason you’re not alone is because this is a tough issue to resolve. In general, people get angry more easily with their siblings than they do anyone else; probably because they know their siblings will always be there. If we got mad at our friends, they might stop being our friends, but no matter how angry I get with my sister, she’s still my sister… and thank goodness for that!
When both you and your sister are in good moods, try talking to her about this. Pray beforehand that God will help you both stay calm and don’t make any accusations or bring up specific circumstances. Colossians 4:6 says, “Let your conversation be always full of grace.” Tell your sister that you care about her and that you want to argue with her less. Chances are she feels the same way and doesn’t know how to get along with you better either.
If you don’t feel like you can talk to your sister or you try and it doesn’t help, begin praying about the situation daily. James 5:13 says, “Is any one of you in trouble? He should pray,” and 1 Thessalonians 5:17 says, “pray continually.” Love your sister as well as you can by being patient with her and praying for her. It may not happen overnight, but God will be faithful to help your relationship.
“Be devoted to one another in [sisterly] love. Honor one another above yourselves.” (Romans 12:10)