Honey, from the info I've gathered in reading your other posts, it is your parents that are the bigger issue here...refusing to spay her, and allowing her to become pregnant OVER and OVER AGAIN is so highly irresponsible, and neglectful, I can't even tell you. I know you want her spayed, and you want to do the right thing more than anything in your situation. It seems to me that while your parents may love the cats, they are either under-educated in regards to normal cat behavior, and the importance of having your pets altered...either that, or they just don't give a rip either way. It's sad, all the way around, and I definitely feel for you at your young age, when it is so much harder to truly have control over certain aspects of life.
I think most of us on here would be marveling at your emotional maturity and strength if you did decide to re-home Mika and Stormie...it's a heart-breaking and very difficult decision to make. I could also understand why you would choose to not re-home them...however, be prepared for pro-longed heartache and stress in knowing that Mika will continue to not be spayed, and allowed to breed and reproduce indiscriminately...which is every bit as unfair and wrong as people have described to you. A single queen can be responsible for the production of 45,000 cats/kittens in a 5 year period, including the births of her own offspring. That's 45,000 more cats and kittens that will most likely end up in shelters, as strays and ferals, and will most likely never know what a real home is with love and human companionship. But, the cycle with Mika can stop with you...and it would be a decision made out of love, and the desire for something better for her and her kittens.
Whatever you decide to do is entirely that...YOUR DECISION. And if the situation does not improve with your parents, and their ability to provide what pets need (speutering, indoor shelter, etc.) does not turn around in the very near future, I know that many of us here on TCS would understand if you made the decision to surrender Mika to a no-kill rescue or shelter.
I would also refrain from taking in any more cats or kittens, or dogs, until your parents come around and see how important it is to have your pets altered...you don't want to surrender your cats, only to bring other animals into the same scenario.
Take care, and know that we'll support whatever you decide.