[mothered]

Just because i have never done one before and unsure what the process is.. so if i get one signed by one of my family members who is authorised to do it, and submit it to ebay that is okay? i assume it is required for ebay to move forward with their investigation

Rest assured, there Is nothing to be concerned about.

As you've said, It's only required to move forward with the claim, so It's perfectly fine to sign It.