Should I have ill intentions towards my family when they came to visit me from another country?
What kind of ill intentions do you have? I'm surprised by that.
I've decided to cut them out of my life for good.
I don't know whether you have a good reason to cut them off or not. But I think you shouldn't let them go to all the trouble and expense of visiting if you plan to cut them off.
Nah, I'm going to do it anyway.
You might want to call them and let them know in advance that you don't want to see them so they can get a refund. If you want to cut them off, that is your call and I am sure it's justified, but at least don't financially burden them for no reason. It's the least you can do.