Putting your work up for critique is scary, but getting feedback is the best way to learn and progress.
To answer your original question, if I have to choose between only the above options I would go for Chapter 2 as your opening chapter — although I would do a thorough edit of it. The prologue and mini-prologue are nicely written but comes across as too vague and don't really do anything for me.
Regarding chapter 2, one of the biggest and most useful advice I received in the past is when it comes to scene, enter as late as possible and leave as early as you can. The opening scene starts too early in my opinion and would be more engaging starting with Mahime already in the home. At the moment, the first few pages are just set up. The opening is where you need to grab the reader's attention and set up doesn't do that. I was only able to read the first couple of pages, but something I've noticed is that you used a lot of bookisms, such as exclaimed, murmured, spluttered, protested, etc... It feels heavy and also that you don't trust your reader. It's best to keep away from those whenever possible and if you need to use one to confirm who's speaking then it's better and simpler to use 'said'.
Now if it were me I wouldn't go with any of the above options. Based on your synopsis, the story seems to start when the triplets are grown up and with Roe and her guardian. That's where I would start with the opening chapter. The birth, the trinket and parents' murder feels like backstory that can be drip-fed throughout.
Sorry I don't have time for more in-depth feedback but I hope this helps.