That's right, Philip is at university still at the start of the game, at some point he'll be added - I have some fun scenes planned for that... but a bit farther down the line.Does anything happen in the third bedroom in MC's house? I think it's called Phillip's room or the like. A placeholder for future (step)brother content, perhaps?
Also, the aftermath of the lemonade sale scene where you're stranded far from your house is pretty epic.