It seems like you might not have a very close bond with your dad. Fair enough but now he comming to see you. I think you should send the time. Talking about not personal stuff but like how have you been? We regret it when someone we love goes and we even more regret the little time we have with them. So make the most of it and the out come with your dad could be that if worse comes to worse he will be there for you like you will be there for him! Having weird feelings are normal if you have been so far apart...
My advice try to do the best you can to make the most of it when he comes around. Also let go of the past and see him as your dad not a stranger. Good luck esthersvirtue be you!