Is it 2 families that have no link composed of a total of 5 persons or a normal family(3 or 4 members) + the grandparent(s) (1 or 2 member(s)) ?
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From the context of the story it can be assumed that they were from two separate households simply located in near proximity to the source of the explosion, for a total of 5 people. There is, however, no specific detail as to the makeup of these families and their relationship to one another (as this is likely not relevant to the story and in interest of privacy).