Yeah, these are great candids!
I know you didn't invite critique, but there are just a couple niggles. If these comments aren't welcome feel free to let me know; it won't offend me.
First, your cousin with the football is brilliant, but IMHO there is to much headroom in the photo. Cropping in to a square or even a horizontal aspect ratio will make this image much more balanced and dynamic.
Second, on the photo of your uncle playing the fiddle. A really good study in every way except his mouth. To be able to see all of the expression on his face would complete the image like no other improvement.
Candids are, of all photographs, the most difficult to get perfect, but you definitely have a knack for it. Keep at it!