Sure but some people don’t claim incompetence they are (no jugment here) incompetent. If you tell someone do the laundry but he had no idea it means:

• sort the cloth
• select the cycle nor how to select a cycle
• add the detergent + any extraproduct
• run the cycle
• do that for each type on cloth you have sorted.

He might put white with colors, delicate with cotton. Add detergent but nothing to prevent color leaking. And select a cycle that too hot, damaging some cloth. He did it. He did his best. But his best is worst that when you are careless because he doesn’t know what he is doing. If you would have realized he was not taught to do the laundry, you would have give more explanation or a few smaller tasks.

You should be doing that all year long. These are not ferral kind. You have a responsability to parent them.
Actually, the rush of the holiday is the time when they should participate slighty less if they are not old enough to do some task independently. Because you must move quick and there is less time for teaching.