A very enjoyable story, @ubani1. It has a very good story arc, with suspense, well-defined characters and a good resolution at the end. Well done!

As usual, I will share a tip with you. :-)

In your story, you have three females - a mother and two sisters. This means all of your pronouns should be female pronouns. So every instance of "he" should be "she", every instance of "him" should be "her", and every instance of "his" should be "hers."

For example, the words in bold should be "she" and "her":

I have a little sister, who loves making troubles and looking for a fight he can't win. Though I still love him.

I think there are a few other instances, but that was the most startling because it's the opening line. I hope that helps!