I have nothing on Lucretia's children. I descend from Joshua's brother Joseph Wheaton Adams, and have concentrated mainly on the Adams line. Lucretia's age on her death record in 1891 was 66. As she died in Mar. I calculated she might have been born later in the year, coming up with a birth year of 1824 or 25. Since she stated she was 47 in 1881, that would give a birth year of 1834. Either the person who gave the information for her death record was mistaken, or Lucretia lied about her age on the marriage record. As you say she had a 9 year old child in 1881, the 1834 year seems more plausible, although I suppose it might be possible for her to have given birth at age 48. One correction I need to make. While Joshua was bur. in E. Killingly, I do not find Lucretia's name in the sexton's records for Killingly.This would suggest she was bur. elsewhere, possibly with Abijah Browning or with her parents.