There is no birth record for Thomas Sill, but may have been born about 1699, or before Richard (about 1685-1693). Edward, Richard and Thomas were all witness at both the Richard Sill to Atkinson marriages.
There is no birth record for Thomas and Edward Sill jnr, but a gap in the years where Thomas and Edward may have been born. Edward, Richard, Edward Jnr and Thomas were all witness at Richard Sill's marriage to Isabel Atkinson.