Set Start and End Date for Two Tasks

I'm trying to find a solution for populating a start and estimated completion date for two tasks simultaneously. For example, I use headings for Start Date, Est. Completion, and Completed. I have a task (Validate Scope) that should mirror the Start Date and Est. Completion of the Execution task (parent row). I tried using Start-to-Start and Start-to-Finish to accomplish this, but the Start and End date for the Validate Scope task remain the Start Date of the Execution parent row.

I've highlighted the cells in a screenshot of my sheet below:



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