Andy and Nate are best friends yet total enemies.
You parents know what I'm talking about. Either they are playing sweetly together or screaming at each other and wrestling each other to the ground.
Andy and Nate's sibling issues seem to be compounded by their SPD. Andy is auditory defensive, while Nate is auditory hyposensitive. Because of this, Nate talks non stop, very loudly, which drives Andy crazy. When it gets to be too much, Andy yells at Nate and then hits him. Obviously Nate doesn't like that, so he hits back. Nate is tougher physically than Andy. Nate hits harder, which Andy reacts to very sensitively, which almost always results in Andy crying.
Also, Andy hums when he's preoccupied and concentrating on something. This drives Nate crazy. So, when he's had enough, he yells at Andy. Since Andy has auditory sensitivity, he gets mad when Nate yells, so he yells back or hits him.
Does this sound like your house?
Andy is also easily overstimulated, and because of that, he prefers to spend time by himself in his room decompressing. Nate constantly goes in to bother him because Nate is the opposite...he's an extrovert who wants to be the center of attention. It seems like almost daily I have to tell Nate to get out of Andy's room, to only go in if he's invited, yada yada yada.
Sometimes parenting two children with SPD is exhausting and near impossible! You never know if it's going to be a "you're the best brother ever" kind of day or an "I hate you and get away from me" kind of day. Never a dull moment...