I'm reading city of glass atm and i so think Sabastian is realy the son of valentine not jace!!Either that or he is Valentine discuised.Any one else agree???

ok, if i where to tell you this it would ruin the rest of the book.i will tell you that Sebatian is not Valentine in disguise, and that your on the right track with the first statment!!!!!

have not read it yet

he isn't valentine in disguise. That isn't valentines' style