Anne - cannot attest to accuracy.It is possibly a typo-since 6 years between births is a long time (for that period). However, Bible also states: Joseph C. Engle son of Joseph and Lydia Conrow Engle was born 2nd day of the 9th month of 1817 (so if these dates are correct then Joseph C. and Sarah C. would be twins.)
Joseph C. married Emily Maria Haines daughter of Abel and Elizabeth Haines.Emily was born 9th day of the 5th month 1818.Children: 1.Marianna Engle born the 17th of 5th month 1843 2.Tylee B. Engle born the 13th of the 12th month 1844 3.Elizabeth H. Engle was born the 12day of the 8th month 1846. 4.Martha H. born the 28th of 1st month 1849 5.Joseph born the 3rd of the 9th month 1850 6.Howard Abel born the 10th of the 10th month 1852 7.Jervis born the 17th of the 12th month 1854 8.Walter C. born the 3rd of 6th month 1847 9.Emily H. born the 15th of 11th month 1860
There are alot of interfamily marriages with Engle/Haines/Conrow/Coles/Burton/Lippicott/ etc.