Today my 12-year-old son asked me how much daddy makes. How do I have this convo with him? How much do I disclose?

Since he is 12, I feel it is time to teach him the concept of how money works in the adult world. You can also take this time to let him know what are the major expenses that Daddy and Mommy have to pay. You could get him to write down on a piece of paper what he thinks Daddy has to pay for i.e. home loan, groceries, TV, utilities etc. You could tell him the full amount; it doesn't matter. If there is a lot of money left after expenses, teach him the importance of saving and investing for the future. That way, he'll develop a healthy mindset towards money.