If your parents are old people they probably have a hard time understanding something like Bitcoin, this is not uncommon, older people usually find it very difficult to adopt new technologies. Just imagine that you are used to paying cash all your life, then some plastic cards come, and you have to get used to them. Now we have Bitcoin which is something else entirely, older people will mostly stick with traditional banking than to experiment with something new.

However, some things should not be too difficult to understand if they are explained in some simple way. From where Bitcoin is coming, how to send / receive transaction, what is coin address and what is private key / seed.