Go down on the last week of the month, steal their utilities bills, and put it on auto-pay.

You don't want to get into a situation where you think its taken care of and they're actually freezing to death out of pride.

https://www.wcvb.com/article/actress-alicia-witt-parents-found-dead-worcester-statement/38884722

Take them on vacation.

Send random boxes of things they might not always use but could want or need. Use another first name but their address. Send randomly and to the same person. If you send untracked no return they have no choice but to keep it.