He and the sender of the peculiar parcil do not know eachother well
They met each other b4 (in real life) ?
they know each other thru some other form of 2way communication (phone, internet) ?
does the
ARM represent something special to the receiver ?
do any of the family members know each other better ( i mean like, i 'know' the spouse of some collegues, but only vaguely, yet i know their husbands much better. So maybe the wifes know each other well)