How to manage younger sibling at home while older one is "working"?

[AllyCat]

3. He's 4. And yes, 3 hours is really good.

We get lots done then. However, there are times my older son really wants to do something/learn something and gets engaged and his brother gets ticked because he won't play trains with him.

You are both right about his OWN activity and that including him is probably not going to work most of the time unless it's a "field trip" as they call it. We are finding some story time good as the weather is getting cold. They do like to get up and start reading with me in our pajamas. That's apparently the height of cool with them (for now).