But there does seem to have been some familial tendency towards imagining drama where there was none.
These species do not show familial tendencies, leaving their young to forage on their own.
All races and sexes are equally susceptible to this disease, although a familial tendency has been reported.
Studies have found little evidence of familial tendencies towards osteoarthritis of the knee and hip, for example.
The familial tendency to develop these cancers is called hereditary breast-ovarian cancer syndrome.
There's a familial tendency so may be some sort of genetic link, with one in seven first-degree relatives (parents, siblings or children) also being affected.
"There is a familial tendency, so obviously there's a big genetic component," he said.
The cause of WHS is unknown, but familial tendency to the disease has been indicated.
Clinical features along with the familial tendency may be enough to make a diagnosis.
To what extent a familial tendency is inherited or is due to environmental forces is a point of debate.