Translation:The brothers and sisters will read the victims' names.
It could be victim's or victims' depending on whether there is more than one victim or not, but if no apostrophe is provided, there needs to be one or two additional "the"s and an "of" so that the sentence can be reworded. "The brothers and the sisters will read the names of the victims." and "The brothers and sisters will read the names of the victims." would also be correct and not require an apostrophe s.