Line changes color when change size

[L.Leslie]

Hello

I make designs where I create shapes then put child layers within them. Sometimes, to get the look I want I make the "holding" shape line clear. When I try to change all the line sizes within the document and select all to make it faster there are 2 things that happen that I would like to prevent: 

1. The child layer lines stay the same. Is there a way to get them to change at the same time?

2. The clear "holding" lines turn black when they are resized and I have to go in and change them all back to clear. Is there a way for them to stay clear as I resize them with the rest of the shapes?

I made a video that shows both occurrences. 

thank you

Laura

[DM1]

Select the Group layer rather than the Rectangle layer then apply changes to line size. Line thickness changes on selected layer.