I understand you as the first male of your house. It is not easy especially when the parents are not around. It forces you to be hard working and caring.
Yet the human nature can be a type sometimes, reason why your siblings are lazy when you are around because they if they don't do it, you will certainly do it.

Good luck for the success.
Please have a look on my post.
I will be happy to read your impressions on my post.
Stay Blessed.