Fun&care...I understand your point but I don't look at my parents as my employer. I provide a service and send out a bill when payment is due. No different than a contractor, hair dresser, nail salon etc. I do agree that they should remember when payment is due but my payments change due to stat and holidays so I don't mind sending out a text/bill to remind them that it's payment and how much they owe. I would rather do this than have Friday come along and have to wait while they go back home to get money.

It's annoying but part of the job. Talk to any contractor and I can bet that almost all have the same issue.