The 1900 census for Troy Township (that part east of Brushy Fork rd.), Perry, Indiana shows the following family: HeadHarman BrownMBorn Jun 1869 Indiana SpouseMargaret E BrownFborn Dec 1869 Indiana ChildMyrtle A BrownFborn Jun 1889 Indiana ChildNancy C BrownFborn Jan 1890 Indiana ChildWilliam BrownMborn Mar 1893 Indiana ChildJames O BrownMborn April 1895 Indiana ChildMary C BrownFborn May 1897 Indiana ChildHarman BrownM born Dec 1899 Indiana Census record here: https://familysearch.org/pal:/MM9.1.1/M9ML-JFQ
No record of them in the 1910 census.
They were in Calhoun County, Michigan in 1920.The census shows this family: HeadHarmon BrownM 50y SpouseMargaret BrownF 49y ChildRussell H BrownM 20y ChildBenjamin F BrownM 17y ChildBelva L BrownF 13y ChildJohn J BrownM 11y ChildNannie HarrisonF 28y Ruth M HarrisonF 9y Roy A HarrisonM 8y Cecil D HarrisonM 5y Ruby A HarrisonF 3y7m William D GowellM 18y Katharine O GowellF 20y Jessie BrownM 17y None of the children are the same as those in the 1900 census, but in 20 years the ones from 1900 may have grown up and moved out of the household.The 1920 census is here: https://familysearch.org/pal:/MM9.1.1/MZSF-6Z8
I wasn't sure that the 1920 census was the same family, until I found a death record on 8 February 1920 in Battle Creek, Calhoun, Michigan, for son Benjamin F. Brown, which named his parents asHarmon Brown and Margaret E. Richards. Here: https://familysearch.org/pal:/MM9.1.1/FHD5-3LR
By the 1930 census they were back in Troy, Perry, Indiana, with only one child remaining in the household: HeadHarmon BrownM 60 SpouseMargaret E BrownF 59 ChildJohn J BrownM 20 1930 census record here: https://familysearch.org/pal:/MM9.1.1/X4BS-1RG
Harmon Brown was the son of C.C. Cynthia Brown.The 1880 household was: Household Gender Age HeadC. C. BrownM 56 born Rhode Island SpouseCynthia BrownF 40 born Indiana ChildMelinda BrownF 16 ChildSarah BrownF 15 ChildJohn BrownM 13 ChildHarmon BrownM 10 ChildBenjamin BrownM 6 OtherJohn ReedM 26 Census is here: https://familysearch.org/pal:/MM9.1.1/MHS3-24G