Kyle needs a large bed quilt, so the block is designed to be 12-1/2" square unfinished, so I am using a 4-1/2" unit. For each block you need one dark square, one light square, three 4-1/2" half-square triangles and four 4-1/2 double half-square triangles.
To make the half-square triangles, cut a 5" square from both dark and light fabrics. Draw a line from corner to corner down the middle and sew 1/4" on each side of the line. Rotary cut along the line after sewing on both sides. To make the double half-square triangles, cut a 5-1/2' square from both dark and light fabrics and draw a line from corner to corner down the middle, sewing on both sides of the line. Rotary cut along the line after sewing on both sides and then again, corner to corner.
Press them as shown. Sew the double-half square triangles as shown.
I always square up. It's a "fussy" habit, but even Eleanor does it!
I always arrange the pieces before sewing them together with 1/4" seams. That's it!