Snakes are a Suborder and are therefore higher u the classification rank than family.The full classification of a snake would beAnimalia- Chordata- vertabrata- Reptilia- Squamata-...
I'd look at ancestry.com. But I also found this business that makes journals for those trying to record their family's stories... http://www.handhewn.co.nr/
Addition.
The largest family I know is...