If your Peter MINNER died about 1835 in Indiana, it is obviously a different Peter in the 1840 Census in Delaware.I have a James Minner in the 1820 Census in Indiana.James apparently died before 1840 and his wife was named Letitia.Another migrant from Delaware to Indiana is Noah Minner in 1820 census.
I have very little information on this particular Minner branch.Noah and James may be brothers.I have not identified offspring for either of these men so your Peter could be son of either one.If Peter died in 1835, he must have not been married in 1830 census and enumerated with his father's family.Both Noah and James were born in eastern shore Maryland, migrated to Delaware and then to Indiana.
I have a Letitia Minner b 1851 that married Josiah WILEY. They both died in 1890s in Yakima so this must be a daughter of the William you refer to.
I have a Minner branch from Montezuma or Marshaltown, Iowa.John Minner & Nancy Ellen FRY, both born in 1890s are the parents of George, Earl, Clara, Lloyd, Glenne, and Afton (births 1906-1919).Don't know if this John is descendent of your Iowa Minner family.
Good luck in your research and let me know when you have some information to add to my database.