Coolidge and Tunney are Bonedust's younger twin brothers. In Baby Brother, Robert always brings a pickle with him so he can identify which is which, since he needs to give a pill to one of them. One spits out the pickle and the other eats it happily. Along with the rest of his friends, they wash their baby brothers at the barn.
Coolidge and Tunney were played by Richard and Robert Smith; Richard playing Coolidge and Robert as Tunney.