I know it can be hard with an older child around, but it sounds like maybe he could use a bit more time out of the house. I know my own toddler gets a little nutty if she's cooped up inside for days on end and we also live in a cold climate so it's not as easy as running around in the backyard everyday. I'd look for active things like a toddler gymnastics class or an indoor trampoline place, or even things like a weekly library trip (perhaps during story time) or a music class geared towards toddlers. Or what about swimming, is there an indoor pool around? Many of these activities don't last too long so your older child could bring something to work on while the toddler works out some energy.
