Attached Link: http://www.rbtwhiz.com/rbtwhiz_EMCPrintable.html

Not sure I understand exactly what you are doing, but in answer to the title of this thread "Can a morph target be used to effect scaling of children?", the answer is both yes and no. No because a morph target its self only affects the actor it is applied to, and yes because any channel can affect any other by the use of ERC (Enhanced Remote Controle.

As an example if you wanted the 'targetGeom RoundFace' morph channel in Posettes head to affect the 'scaleX xScale' channel in her neck you would add the folowing code to the 'scaleX xScale' after the line "interpStyleLocked":

                        valueOpDeltaAdd<br></br>                             Figure 1<br></br>                            head:1<br></br>                              RoundFace<br></br>                   deltaAddDelta 1.000000

Placing this code in the channel makes it a slave of the "RoundFace" channel in the actor "head:1" in "Figure 1", lines 4, 3, and 2, respectivly.

The entire scaleX channel would look like this after the slaving code was added:

          scaleX xScale<br></br>                       {<br></br>                   name GetStringRes(1028,6)<br></br>                   initValue 1<br></br>                 hidden 0<br></br>                    forceLimits 0<br></br>                       min 0.1<br></br>                     max 100000<br></br>                  trackingScale 0.004<br></br>                 keys<br></br>                                {<br></br>                           static  0<br></br>                           k  0  1<br></br>                             }<br></br>                   interpStyleLocked 0<br></br>                 valueOpDeltaAdd<br></br>                             Figure 1<br></br>                            head:1<br></br>                              RoundFace<br></br>                   deltaAddDelta 1.000000<br></br>                      }

For more info on ERC see the link above, or:
http://www.nerd3d.com/Tutorial/SuperMorph.htm