bobf is quite right: the statements
my @args = @_;
my $who = shift @args;
my $families = shift @args;
are much better written as
my ($who, $families) = @_;
Also, $families in the above example seems to be a hash reference,
so use %$families to dereference.
Further,
for my $family (%$families) { ... }
won't do what you want; use
for my $family (keys %$families) { ... }
to iterate over the keys of the referenced hash.
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