I wonder how many different Sister's Choice blocks there are? This isn't exactly like the one I made. I've seen others and they are close but not the same. I think it all depends on the middle. Mine is rectangle. I think it was mainly used as a Friendship block because it gave a large area in the middle to sign your name.

Check out Rose Ludlows site I believe she has it for free.

Absolutely - the block is called Sister's Choice, Farmer's Daughter and several other names, but the block pattern can be found on quilterscache. I made a blue and white version 2 years ago when making a family reunion quilt in memory of my Sister who had passed away 2 years before. We also grew up on a farm in SD, so either name was appropriate. It makes a beautiful quilt, like the one you pictured.