Here is some info on later generations of the Boston Roulston(e) families. Most of these I do not have enough info as yet to tie them to gether. Every generation had a John or two it seems. I included Elizabeth Greenleaf since she must have been some relation to Mary Greenleaf, w/o John Roulstone.
From the book, Inscriptions and Records of the Old Cemeteries of Boston, by Robert J. Dunle and Ann S. Lainhart, New England Historical Genealogical Society, 2000.
Central (Boston Common) Burial Ground:
p. 23 - Roulston, John, Jr. Feb 20, 1822, ae 17 y, tomb #15
The Granary Burial Ground:
p. 423 - Greenleaf, Elizabeth Feb 25, 1825 ae 86y, tomb #26
Roulston, William T., Aug 25, 1831, ae 49 y, tomb #26
Roulstone, John, fam[ily of] John, Jan 18, 1826, ae 48 y, tomb #26
Roulstone, Mary, from New York, Apr 9, 1848, ae 81 y, tomb #26
pp. 441-442 - #66 William Farris and John Roulstone
.... Mary Elizabeth from Roxbury, July 1843, ae 6
Andrews, Mary R., fam[ily of] John, May 4, 1811, ae 7y
Fowle, Abrigail, fam[ily of] John, June 22, 1811, ae 21y
(note: I seem to remember a flu epidemic in 1811)
Roulstone, Adeline, fam[ily of] Michael, Aug 16, 1810, ae 5y
Roulstone, Lucretia, fam. Michael, Jan 9, 1817, ae 1 month
Roulstone, Michael, fam. Michael, Nov 22, 1819, ae 21 y
p. 501 - No. 198 Michael Roulstone, Thomas Redman and Asa Page's tomb
Roulston, Eugene Lucretia, fam. Michael, Aug 7, 1838, ae 2y
Roulston, Mary, fam. Michael, Nov 4, 1832, ae 56y
Roulstone, Francis T., fam. Michael, July 26, 1825, 2 months, 10 days
Roulstone, Henrietta M., fam. Charles H., Apr 17, 1846, ae 5 y
Roulstone, Michael, fam. of Michael, Nov 14, 1829, ae 9y
I'm looking forward to some replies to this message.