Hello. As for our Snodgrass - Jacobs - Cobb family, according to other Snodgrass researchers, Mary Jane was daughter of Samuel Snodgrass and Mary Chambers, both of Ireland. William Snodgrass (b. ca 1828) was her oldest brother; Agnes was his wife, not Mary Jane's sister, but her sister-in-law.
Her brother Samuel (b. May 1844) married Mary Spining Montfort.
Other siblings were Margaret, Robert, and Elizabeth.
They all moved from Crawford County, PA to McDonough County, IL. Mary Jane's parents were the Irish immigrants
Frank and Bertha Jacobs, daughter Clara Bell Jacobs, son Marvin (Frank was the stepson of Mary Jane Snodgrass, as he is son of Erastus Jacobs' first marriage to Eliza Brown; he was born bet. 1863-1867, died 12 Aug 1942.
His son Marvin married Bertha. Mary Jane Snodgrass. Rose Etta (married Robert Lee Cobb (descendent of Ambrose Cobbs of (Kent England)VA) married 1887) is the sister of Sarah Burton Jacobs.
Rose Etta Jacobs and Robert Lee Cobb are my paternal great-granparents.