Dating and meeting the parent
It’s also true that some old guys don’t like foreigners.
Say, "I'd like you to meet him (or her.)" Then ask if that's okay and take it from there.
For example, all the etiquette about going into a Japanese home – you should know it inside and out.
Get some Japanese down so you can communicate at least a little.
Before meeting the parents, understanding Japanese dating customs and traditions would be of great advantage to you, if not vital.
I’d urge anybody dealing with this issue to learn some Japanese and learn about Japanese culture.