On 11 April 1839, wrote from , Illinois, to his brother in the in , Missouri; Don Carlos’s wife, , added a postscript addressed to Hyrum and JS. In the letter, Don Carlos provided an update on Hyrum’s family, who had departed , Missouri, earlier in the year and settled in the vicinity of Quincy.

This letter was the second one sent to the prison. In his 6 March letter, he noted that ’s wife, , continued to suffer with a “severe cold.” He also reported that she and her infant son were staying with her sister and Mercy’s husband, , and that Hyrum’s five children from his deceased wife, , were staying with Hyrum’s parents. Don Carlos also suggested there were problems with family dynamics. This troublesome news was exacerbated because Hyrum had not received direct communication from Mary. According to the contents of the featured letter, Hyrum apparently replied to Don Carlos in late March, expressing anxiety and asking for additional information about his family. Don Carlos responded with this 11 April letter, reassuring his brother that Mary’s health was improving and that the tensions in the family were partially relieved. Don Carlos also asked Hyrum to convey words of encouragement to JS and the other prisoners—, , and . then added a short postscript addressed to Hyrum and JS, expressing her faith in divine providence and referring to the well-being of Hyrum’s and JS’s children.

As with the letters and wrote to the prisoners on 10 April 1839, it is unknown whether and ’s 11 April letter was carried to immediately or held until the received further information about the prisoners’ anticipated change of venue. The original letter is apparently not extant; however, copied the letter into JS Letterbook 2 sometime between 29 May and 30 October 1839.