How lovely, and what a treasure.
I've seen some quilts with blocks outlined with the strongest color in them, then all sewed together with like far from like. In other words, no two colors together.
And I've also seen some lovely ones with a single color banding all of the blocks, with 2 or 3 contrasting colors all around the quilt itself.
I know you will make these family treasures into something that your family will keep for many years down the line. Take pictures and let us see what you do with them.