Always keep in mind there is an XP penalty for all regular classes that Multi-class before 20th level.
If your brother is still a Sorcerer only then he is getting more XP than you because he hasn't Multi'd his character to another prime character class.
Oh, and what Womble said too. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
Kyra_Ny <img src="/ubbthreads/images/graemlins/delight.gif" alt="" />
That's a bit misleading there..
If he's human then no worries. Pally 1/sorc x will get no penalty.
Similarly with his character. Bard 1/fighter 4/RDD will be ok for a human UNLESS he is playing with a game version lower than v.1.64 and raises the RDD level higher than the other 2. Otherwise prestiege classes don't count for the XP penalty