The Marvels by Brian Selznick
The journey begins at sea in 1766, with a boy named Billy Marvel. After surviving a shipwreck, he finds work in a London theatre. There, his family flourishes for generations as brilliant actors until 1900, when young Leontes Marvel is banished from the stage.
Nearly a century later, runaway Joseph Jervis seeks refuge with an uncle in London. Albert Nightingale's strange, beautiful house, with its mysterious portraits and ghostly presences, captivates Joseph and leads him on a search for clues about the house, his family, and the past.
One of the 2016 Lambda Literary finalists in the Children's/YA category for best LGBTQ title of the year, you can add your review of "The Marvels" in comments!