Grose Family Genealogy Forum
Your best bet is to call or visit the Henry County Historical Society in New Castle, Indiana. They are located in General William Grose's original home. The ladies there are very helpful and knowledgable about the General's entire life both before and after the Civil War. I've visited there several times while researching surnames that fought with General Grose and found the information to be very valuable. I know they have much information about his descendants.
Henry County Historical Society
606 S. 14th St.
New Castle, IN 47362