I tried giving my oldest a Minecraft Redstone lesson. The youngest was also watching, but considering he's a little too young I was focusing on the oldest. The oldest listened and nodded to everything, but never ever built a redstone contraption since then, no interest at all (despite the fact that his world would dramatically improve with some of the stuff I taught him). On the other hand, the youngest now often gets to Creative mode and makes dozens and dozens of contraptions using observer clocks, pistons, trapdoors and dispensers.

You can show them that it's an option and give them an introduction, but you can't force them to be interested. They need to be ready and need to choose it.