Ulysses Grant NELSON - First wife of Ulysses

My great grandfather Ulysses G. Nelson was married to my great grandmother Matilda J. Dalton (b. 1876/d. 1911 Lincoln Co., WV) in early 1894. My great grandmother Matilda J. Dalton Nelson died from TB at age 35/36, leaving behind their five children (four sons, one daughter). Their daughter was my maternal grandmother. How are you related? Thanks