There is not a lot you can do, since you most likely do not have standing to be heard in any court. If I understand your statement of the facts, it appears that the child is your sister's with a person other than the person who is going to be sentenced. All other things being equal, her fiance's being in jail or prison should not make a difference unless someone: the child's father, or Child Protective Services goes to court and tries to change the custody or placement arrangements based on alleged risk to the child from the fiance. Is the fiance's crime related in any way to mistreatment of children? Violence towards adults? In such a case, court action is more likely. Good Luck.
Answered on Jan 13th, 2015 at 12:50 PM