What will your LO call your parents and ILs (or SO's parents)?
My DD wasn't the first on either side, so my parents were already Grandmommy and Popple. My ILs asked to be called Grandma and Granddad. I was a little disappointed since my sister and I called our grandparent's Who-Who and Dadaddy on my Mom's side and Grandma and Big Daddy on my Dad's side.
BUT DD calls the ILs Nanma and Nandad, so at least she got a little creativity in there.