NOTE: TO MAKE THE BLANKET KEEP CROCHETING ROWS TO REACH PREFERRED SIZE and also be sure to remember that in each corner you do TWO double Crochet stitches then a single crochet and another two double crochet stitches to define the square. Enjoy.
You should now have four sets of three double crochet combined
chain one and slip stitch to the other end to form a small square
Now to increase the square:
On the corners of the square be sure to Double crochet two, chain one, and then double crochet two
For the spaces in between the corners double crochet 3 times as you did in the beginning