OK so I stated hearing voices in my head about a year ago I thought I was going crazy so I said "WHO ARE YOU?!" out loud physically. Turns out they weren't gonna hurt me and they weren't demons. After a while of talking and getting to know them they told me their names. One was Mckenzie and one was Makayla. then after about a month they let me see them Mckenzie has short blond hair with a tint of light purple and purple eyes. Makayla has red/maroon hair with a tint of black and maroon eyes. We're able to communicate telepathically but now they told me something a little weird they said that we were parallel sisters... we were supposed to be triplets, but the died before they were born... what is this!
The only thing that makes me question this is alot of times when u do have siblings that die before or while birth they are undeveloped and so they don't develop like you and I do. So they would not e able to talk or even look like that because they were undeveloped in the first place. I'm not really one for assuming things and I am also not one for telling you I don't believe you. Everyone has there own opinion and beliefs. So all I will say is giving these facts mabe they can help you figure out what this is
You could ask your parents though it would sound odd to them. They would have known if your mother had any miscarriages and if she was ever potentially going to have triplets. In the end this seems like your imagination more so than any actual spiritual connection with the deceased. If you believe in any sort of afterlife considering they weren't even born yet they should have crossed over, been reincarnated, etc...as they had nothing to tie them to this plane of existence. They would also lack the same maturity as you due to the age they died making this again seem unlikely. Still as strange an enquiry as it is the easiest way to know if it is even remotely possible is to somehow learn if your mother had any miscarriages and/or was ever expecting triplets.