It sounds like your brothers & father are candidates for the Quilt Police Academy. It's your quilt and you can do it any way you want. If they want to make quilts and add batting--give them directions to the quilt shop.
I don't add batting to a quilt that has fleece for the backing. I did add batting scraps to the 2 denim faux cathedral windows quilts I have made because one is supposed to be heavy for hubby's restless legs and the second was made to be a play mat on a hard floor.