Aww... all of this warms my heart. Spider sounds like he's doing great! And I love the sound of a new brother for him. Please take pictures!!!! We all NEEEEEED pictures!!!!
They're both adorable. I'm terrible at coming up with names... How about Grasshopper.
I have one of those LDGs too! Here the ground squirrels and voles have more to fear than the grasshoppers. Too bad my goats HATE him and pummel him at every given chance, so he stays in the house which doesn't make him much of an LDG... But he did chase off a couple stray dogs the other day so he earns his keep now and then.
Both very cute! How about Cricket? Or Charlie (the reasoning being Charlotte the spider, and you have Spider and since the new guy is well, a guy, Charlotte wouldn't work, but Charlie would!)?
Or you could name him Wilbur since the Charlotte's web thing came up. But he reminds me of a cat I used to have (same coloring) his name was Gideon. Then there was one other thought you know that story that goes "said the spider to the fly" well FLY would be a cute name and it would go with spider according to that little story. Good luck picking his name.