Lewis Rishel and Peter Rishel are definitely brothers:
David R RISHEL & Sarah / Salome SHOOK: 1. Mary Elizabeth Rishel (b. 1828) Married John KERSTETTER (lived in St Joseph Co) 2. Lewis Millard Rishel (b. 1830) married Eliza Jane SHOOK (lived in St Joseph Co) 3. John Rishel (b. 1831, died 1852) 4. Christiana Rishel (b. 1833) Married Samuel ROBBINS 5. Peter S Rishel (b. 22 Feb 1834) Married Mary Ann SPRINGER 6. Michael Rishel (b. 30 Dec 1834, d. 1836) 7. Jonathan R Rishel (b. 1838) Married Rebecca Jane SPRINGER 8. Rebecca Jane Rishel (b. 1840) Married William JONES 9. Charles Kaufman Rishel (b. 1842) Married Hetty E SPRINGER 10. David Roberts Rishel (b. 1844) Married Prudence MARCY; Married Mary Ellen SHIRLEY 11. Sarah Ellen Rishel (b. 1846) Married John NORTON
David (the father) married a second time to Christene Shook SPRINGER.
Lots of intertwined families. I'm descended from Mary Elizabeth Rishel and John Kerstetter.