You're doing a great job with the translations!
Btw no need to strain yourself to do more, I enjoyed what you have given us so far, so you should continue if you want to!
It's frustrating to see the MC get basically shit on by everyone. I myself have an older sibling, not a sister so I don't know if that changes anything but COME ON let the MC get at least one win or something. When me and my brother fight or tease each other I can most of the times defend myself...