Is it going to be difficult for me to get to Khrabuzna from Poland?
I've had a quick look and it doesn't appear to be so much difficult as very time consuming. Not sure which airport you are flying into, but the easiest departure route would be from Rzeszów to Khmelnytskyi. From there you could get a taxi/bus to Khrabuzna.
It's possible to get a bus there, but it's a long trip, anything between 10 1/2 and 13 hours depending on which one you get. For example:-
I don't think you and your wife would be that comfortable on a bus trip that long.
Unfortunately the train isn't a much better option either. I checked on Bahn.de which gives the most reliable and up to date information, and there is a sleeper train from Rzeszów ( I've put a random date in during your trip ), but that takes 14 hours, with a prolonged stop in Lviv ( almost 3 hours )
Even by car it is about a 6 hour trip as it is roughly 420 km away from Rzeszów.
A private driver would be the best solution if money isn't an issue, but I have no idea how you would go about getting one. Maybe others here can advise.
Never has my heart been touched like this. Maybe because I am old is the reason.
Different things become more important as we get older, and let's face it, you're going to visit the countries of your ancestors! Very exciting and emotional for you :-) Wishing you a fantastic holiday, and hoping you get to achieve everything on your list.
Just checked the bahn.de link and for some reason it hasn't put the destinations in. You will have to enter them, but Khmelnytskyi is spelled as Chmelnizkij on this site.