--in create(), have this block to grab all child objects.
self.attachables = {} -- create a table to put the children into
for i = 1, MovableMan:GetMOIDCount() - 1 do --we have to use getmoidcount -1 to prevent errors
  self.mo = MovableMan:GetMOFromID(i) --get the mo, use self.mo for simplicity
  if self.mo.RootID == self.ID and i ~= self.ID then --if it is a child of us but not us
    table.insert(self.attachables, ToAttachable(self.mo)) --then put it into the table.
  end
end
--then, in update(), have this block, with whatever you want to do in it.
for k,v in ipairs(self.attachables) do --iterates through the table
if string.find(v.PresetName, "INSERT THE PRESETNAME OF THE ONE YOU WANT TO DO STUFF TO HERE") then --find the presetname to identify the object.
v:function() --do stuff on it here
--more stuff here if you want
end
end

for k,v in ipairs(self.attachables) do
if string.find(v.PresetName, "INSERT THE PRESETNAME OF THE ONE YOU WANT TO DO STUFF TO HERE") and v.RootID == self.ID then
--do stuff on it here
else
--elseif v.RootID ~= self.ID then --use this rather than plain else if you want to only remove attachables that arent attached anymore.
table.remove(self.attachables, k) --clean up useless pointers so we dont have to keep filtering them out later on
end
end