Item 1.The name of Delia Lanman may be correct but could it be Delia Landman. Her father has
been indicated as Henry T., thus could it be Henry T. Landman.
Using the <familysearch.org> and spelling of Henry T. Lanman also brings up numerous
spellings as Henry Landman but unable to positively connect.
Item 2.In the Family Group Record of <familysearch.org> did find a Henry Thomas Lanman, born
01 Jan 1825, Kingston, Plymouth, Ma. Period in question is pretty close but it shows date
of death as 08 Jun 1826. If this is the case it could not be our man.