Rehoboth (Keepers of the Ring #4) by Angela Elwell Hunt

A brother and sister search for each other after being separated by an Indian prince and his war. . .

Gifted adult-fiction author Angela Elwell Hunt continues her exciting American historical Keepers of the Ring series. In book 4, Rehoboth, Daniel Bailie takes his children, Mojag and Aiyana, to minister to the praying Indians. Mojag, however, abandons his father's ministry, feeling that he's been led to serve the heathen Indians, who are on the brink of war with the colonists. Travel back to an amazing period in America's past as Angela Elwell Hunt teaches us how to witness to the world without becoming a part of it.