George Washington Robinson married Ransom Allphin's sister, Emily Catherine Allphin. A member of Capt. Ware's company, he was wounded in the Battle of San Jacinto and received a land grant for his service. Sam Houston later appointed him a lieutenant in the Texas Rangers. During most of his life, however, he worked as a physician practicing frontier medicine near Midway in Madison County.
A considerable amount of information on George Washington Robinson can be found in the Texas State Library & Archives in Austin. I haven't checked to see what may be in the Daughter's of the Republic Library at the Alamo.
He was a son of William Robinson, fourth regidor at San Felipe de Austin, and a delegate to the convention prior to the Texas Declaration of Independence. William, who was a ordained Methodist minister, settled near Huntsville and was a colonial surveyor prior to Texas independence. After Montgomery County was established by the Republic of Texas, he was elected to be the first county surveyor. There is information on William Robinson, some of which is incorrect (such as his place of burial) in the Handbook of Texas.