Kudos, Eva! That is correct. Theodore Weld, the abolitionist leader, had stayed at Mrs. Sprigg's in the early 1840's, and the quotes come from letters he wrote to his wife.
I may stand corrected on this, but I believe most of the boarders at Mrs. Sprigg's left their families back home. I think Lincoln was unusual in that Mary, Robert, and little Eddie were also boarding there with Abraham. I think the vast majority of Mrs. Sprigg's boarders did not have their families with them.