I guess it depends upon which family members :) for a husband, I’d say no. Ann Landers had a pretty realistic take on this. Even tho the original Q was about hubby dropping clothes on the floor.
She said that some people are droppers and others are picker-up types. If his parents weren’t able to make a picker upper put of him, it’s highly unlikely you’ll succeed. Same principle with the lights.
However, if it’s kids or mooching relatives, that’s a different story.
But the most likely answer is “no” if it means constant nagging. That gets draining for you and unpleasant all around.
But as a last ditch attempt you could try having a sit down with them and ask them point blank what they would do if they were in your shoes. See what their attitudes are about it. Try to get them to tell you what might motivate them to change.
Or buy compact flourescents which may have a higher initial cost, but use FAR LESS electricity.