Ya put him to work!
My son is 4. Last year he "helped me paint.". Let's just say that it would have been less messy and went faster without him, but wouldn't have been nearly as fun. He has his own "tool box" and will sometimes like to help me out in the garage, but power tools can get a little tricky with kids around.
I do think that it's awesome to get my kids in a bee suite and around bees. My 2 year old isn't big enough to get the suit on and help, but we often watch the bees. She always asks me if the bees are making honey. I have a suit for my 4 year old and he loves to help. He likes to help me find the queen and blow on the bees. Of course blowing on the bees isn't very helpful, but it's fun. Hopefully we can continue to enjoy this together for years to come. Hopefully you can share your hobby with your grandson for years to come as well!