min/max scale fails

[mm]

Hello, I'm having an issue with setScaleMinMax property on sprites, I have two sprites, parent and child, the child is set to a min/max scale of .5 and the parent is scaling freely, I'm having odd results when scaling the parent. The parent also rotates, in some angles the child maintains the scale but in others it scales, what can I do to prevent the child from scaling?

Thanks.