On my paternal side, my g.g.grandfather was the youngest son of an acting family. His father was an actor manager who worked with Thomas Ternan who was the father of Charles Dickens' mistress. His eldest brother married one of two acting sisters, Frances Cranmer Oliver. Her sister Martha or Pattie was an actor/manager in the 1860s and her portraits are in the National Gallery. Her husband was the heir to Phillips auctioneers and when she died, he married his niece by marriage, Katie Hastings, who was also an actor until her death in 1890. Her son, my grandma's cousin, also went into acting and married a star of operettas. When that marriage failed, he went abroad and came back to London with a mistress who became a Gracie Fields impersonator. He had 3 sons in his sixties that I'm in touch with, after believing that he had died childless.
The eldest sister of the original surviving 6 brothers and sisters married an actor manager and had 3 children, one of whose daughters was known as The Disappearing Lady in Edwardian London as she married one of the Maskelyne sons who were famous magicians and she was the leading ladies in their playlets and some of their most famous illusions.
I've loved researching them and have written a blog about them.