Hi, I've seen people ask stuff about Steam Families' shared access to games' features, like DLC (where, from what I've read, the "child" has to buy the DLC for themselves if they want to have it because it does not get shared from the "parent").
But in the case of preordering, I've seen that people only ask if the "play this game X days early if you preorder" feature also applies to the "child" (and read negative answers), however, I don't think I've seen anyone ask about pre-order *bonuses*, like stuff you're ONLY going to get in your game if you pre-order it. So my question is:

If a parent pre-orders a game and obtains exclusive pre-order bonus content once the game releases, then the parent shares a game with the child, does the child also access this bonus content? What could be done if the answer is negative?