In order to teach a newborn child its first language, that
language must be spoken around them all the time. The same principle works when
teaching a baby chimpanzee sign language. In "Half Brother" by
Kenneth Oppel the Tomlin Family adopts a newborn chimpanzee named Zan to
conduct a scientific study about raising a chimpanzee like a human and teaching
him sign language. I think a theme of "Half Brother" is what it means
to be a family.
One example of the this theme is when Zan's Human Father decides
to make Zan's learning sessions more productive by strapping him into a metal
chair for hours. Normal parents wouldn't do that to a teenager, let alone a
baby. The father isn't treating Zan like he's really part of his family.
Another example of this theme is when Zan is having a fit and
biting some of the volunteers (chimpanzees are dangerous and can seriously
injure someone that they bite) and his father bites him on the ear to
make him behave. This must be really confusing for Zan. Half the time they are
rasing him like a chimp and half the time they are raising him like
human.
SPOILER ALERT
My final example has to do with his relationship with his older
brother and mother and how they treat him more like a human. For example, he
ends up in a sanctuary when he gets too strong for the family to take care of.
They specified for him not to be given to a lab but they weren't able to get
the agreement on paper. They end up stealing him from a sanctuary before
he can be given away to a research facility. This act of courage shows
their love for Zan that their father seems devoid of.
In conclusion, in "Half Brother" the Tomlin Family
isn't exactly your average Canadian Family with their chimpanzee son and their
father who treats everything like an experiment. To me, they still seem like a
family though. Also according to the google definition of a family "A
group consisting of parents and children living together in a household"
they do count as a family, up until Zan leaves them. But, in some ways I
think they are still a family long after Zan leaves them.