Okay, from looking at the Creek Nation 1900 census, it really states that Rachel Jacobs is a sister-in-law, don't you think, if Noble is Scott's brother?

Sarah and John Jacobs were the parents of Scott Jacobs, Noble Jacobs, and Dollie Jacobs. All from census card #197.

Marriages: Rachel Grayson - to Scott Jacobs census card #129

Charity Grayson - to Noble Jacobs census card #1340

Rachel and Charity Grayson came from the marriage of Jane Grayson and Britain Grayson. Two sisters married the jacobs brothers.

Scott and Noble were not in the home with their mother, Sarah Jacob, according to the 1900 census, only Dollie.