I'm sorry, Rio, that you have this going on in your life right now. However, I would see if I could watch more than try to participate in this situation, since it is your parent's situation, not yours. It wasn't caused by you and what happens now, doesn't depend on you; what happens will happen but it's a little like wanting to know what is going to happen next month in your own life; no way of knowing. Yes, your car is your mum's but what happens with that, too, will be between your parents, their decision, just as it has always been.

Since your mum has been keeping you informed, this far, I would imagine she will let you know as soon as she knows when she's leaving! She and your father may not have figured that out yet and/or I can't imagine they have even given a thought to what will happen come next Christmas!

Here's a good site where you might inform yourself generally but, since you can't know the details of their marriage or why they're breaking up because it is their relationship, what you read won't be very useful since you can't choose paths because you can't know the details. http://www.divorce.co.uk/

I'm sorry it's uncomfortable not knowing what is going to happen, feeling helpless that way, but it is your parents lives (hard to be forced to separate ourselves from our parents before we might feel ready!). Can you talk to your sister and use her companionship to help comfort you since she's in the same boat?