Did the stutter start as they learnt to speak? That was me, but my youngest daughter was different. Her's came on about a few months after starting to speak. What I did was made everyone "ignore" it. Just let her speak, just to see if it would go away by itself. It did. If it persisted for any longer than month, then we'd do something about it but I strongly believe that it's the anxiety around speaking that while doesn't cause it, exacerbates our stutters.