Thats not good mate.. sounds like the dogs are beginning to make their status in the pecking order... small kids are always the first im afraid.. theyll do it again for sure
+1 big time. Get rid of them, one or two makes no difference. I'm amazed they're still there and you said you won't let the kid near them until he's big enough to belt them. Are you planning on him be Conan or something seeing you had problems. Not good family dogs and cut your loses now, you got lucky mate.
If they decide you're not top dog anymore, they'll go you too
Good luck