I've also discovered that there is already a children's book out there called Bad Luck Boy, though it doesn't appear to be very well known. A conundrum! Should I change the title, or hope it doesn't matter. I'll have to meditate on that further.
Lots of helpful feedback on "Supplanting" from the group today, but I think it's going to sit a while (at least until Bad Luck Boy is done and polished) before I get around to fiddling with it. At least I'm feeling decently hopeful about it becoming what I want it to be.
No word as yet from agents.