There are several definitions of the word family. It can be used to describe all the languages derived from the same earlier language, a group of objects distinguished by common features, and a group of related genera in an order or taxonomic collection (the daisy family, cat family etc).
The most common and familiar use though is for a group of people. That's the meaning I had in mind for my set of family themed short story collections. The latest* of these, Can't Choose Your Family, is available now. For this week, the kindle version is on sale for 99p (or 99c). Usual price will be £1.99 ($2.99)
In order to define family, my dictionary starts off by mentioning parents and their children, but families come in a huge variety of combinations. There may be one parent, or none. Perhaps it's step-parents, or grandparents who raise the children. Maybe there aren't any children. I feel that a family can be any group of people related by birth or marriage, or possibly even by circumstance.
* No Family Secrets was the first. Does that make it a big sister to the second one?