What is the Best gift to give to the Best sister in the world?

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I have 3 siblings but only have one sister who is a little younger than I am. Ever since my mom died three months ago, I apparently being the eldest stood up as a parent to them. With the assistance of my husband during weekends, we are like young parents who do the grocery, settle some bills at home, cook for the rest, etc. But during weekdays, I get so much of help to my sister who is next to me. I know I have been a great daughter but sometimes I am a terrible sister to her. I often yell when I happened to be away from home then arrived as if home is like hell. But despite and in spite of that, she never leaves me along the way with all the taxing chores and homely stuff. I am not a superwoman and not even as clever as einstein to solve a problem in a snap. I am just an ordinary person who if without the help of others I may not be able to do what is asked of me. And so, I wanna give something to make her think that all her efforts are very much appreciated and being there all the time is something I am so thankful about. Any idea what to give her?