I will try to be of some help. These dates that I give are estimates based on the information I have.
The first proven Rowlett in this line is Peter Rowlett, born ca. 1637, d. 1701, He had four known children, and possibly a fifth: Mary, Martha, Peter, and William. His son Peter was b. ca. 1674 in Henrico Co., Va. and d. in 1750. This Peter was married to Mary Ligon before Jan. 1, 1716. They had the following children: John, Thomas, Joseph, William, Martha, and Sarah. His son Joseph was b. ca. 1723 and d. in 1774. He was married to Frances Worsham and they had the following children: John, Mary, Martha, Frances, William, and Thomas.