Example is not the only element to leadership but it's a huge part of it for sure, and you're hit on a very good example of when to you use.

Be it small things like gardening, showing respect, greeting other people and Not coming late to school are already a set of good example.

Setting the example when it comes to manners and courtesy, respect and generosity, humility and caring are ways to show leadership through example. Done enough, and fostered by the individual, those things that can lead a person to a lifetime of emulating that behaviour.

You're a good person to be doing these things and whilst you may never see the fell effect of your leadership you're having a bigger impact than you know. Well done.