Anna: You're going to need quite some time to think about this. You have to really weigh the pros and cons and how heavy the risks are with each option. You also have to communicate with your mom on what she thinks is the better option for you, just to get a second opinion. Communicate with your current university if you can take a leave of absence, just in case all else fails, you can always come back to your hometown.
Marian: I suggest you really look at all the pros and cons, all the possible angles, of your situation. You've been handed a really big decision and it seems like your choice will greatly affect your life in the future so make sure you lay down all the possible scenarios and imagine how things will go if you decide to go with the other one and vice versa. If you end up with an equal amount of pros and cons, just remember that in the end, all that matters is how you're going to react to your situation and how you're going to bring out the best in yourself given the circumstances. You still have quite a lot of time to think about this and I think with a decent conversation with your mom, accompanied by your list of valid reasons, she will understand whatever your decision might be. I wish you all the best!
"There's a new addition to the family and I don't know how I'm suppose to feel about him. I talk to him in a civil manner and whenever necessary but other than that, I don't initiate anything. My mom wants us to become close with this person but I can't even say his name out loud. How do I tell my her that I don't want to interact with someone who's suppose to be part of the family now???"
Anna: This will all just take some time in getting used to. It's understandable on how you feel like he just barged right into your family and you can't stand the person at the moment. But, again, this just takes some getting used to. You don't have to be close but you at least, well, try saying his name out loud. Baby steps. Don't rush yourself into accepting him and your mom shouldn't rush you either.
Marian: This guy entered your lives for a reason that might not be clear to you right now but if you just remain calm and observe him, maybe you'll actually learn to appreciate this new addition to your family. It doesn't necessarily have to be now, but the fact is, your mom chose him already and unless he's being cruel and abusing anyone (in any way, may it be physical, emotional, etc), then there's nothing to really freak out about. Just continue being civil with him and don't judge every move he makes unless you actually have proof of something. Give it some time, he might even surprise you when you least expect it.