The long lost sister

At the begin of the story 2 sister were separated because the parents hated each other and have the unremovable
thing in their right arm after they became friends it was a final fight to see which one is the strongest one while they fighted they knew they were both tough and when they accidentally got shown by there right arm they figure out they were sister and got mad about their parents for keeping that a secret because it was very suspicious why they always hide it and avoid it when both of them confronted each they apologize and get back together!