Your half-brother's full brother would also be your half-brother. Your half-brother's half-brother (assuming he isn't your full brother) is probably what we officially call "no relation," though he might potentially be a stepbrother.
Lentanor is the third dog in a collection of pictures of hunting Dogs that are displayed in the home of Roy and Gretchen Jackson. They have named horses after the dogs in the pictures in order...Barbaro, Nicanor, Lentanor, and so on.
Alice's full name is Mary Alice Brandon Whitmore Cullen. Mary Alice Brandon was her human name, but after she married Jasper his last name ( Whitmore ) was added on to her name. When she became a " daughter " of the Cullens their last name was then, added on to her's.