One difference between a family tree and a phylogenetic tree is

a family tree includes multiple species, while a phylogenetic tree includes one subset of a single species.
a family tree includes only humans, while a phylogenetic tree includes only nonhumans.
a family tree includes animals and plants, while a phylogenetic tree includes only animals.
a family tree includes one subset of a single species, while a phylogenetic tree includes multiple species.

a family tree includes one subset of a single species, while a phylogenetic tree includes multiple species.