I was surprised to see my son mow the lawn with out even me asking him to.
Haha, right on. It's nice when they become a little more self-aware and develop parts of the brain that help them realize it's not all about them, and that it's good to be selfless.
Right! He's learning, I used to have to ask him 5 times and motivate him with money.  Now he just likes to help around the house!
That's the sign of a good parent. You're reaping what you sowed, in a good way. Hopefully it carries on when he's an adult and he becomes another good human being that we have few of