You built the best roll model for young people to their parent... no matter how old fashion they are or how uncomfortable they felt, actually they are telling you "save the money, don't waste it on me" they are all good from heart but never from mouth. That's old generation.
I am now living in US and luckily my parents had much experiences to be US but I knew more people they even dont have any chance to bring their parents aboard due to financial difficult.
You're great and remember this is awesome article and worth to share to your kids (grandson of your papa) to let them know your treatment to our last generation.... which is the best model.
Also, I don't feel this is travel article but the love story instead. Good luck and u are the best!