if its going to be 3 piece final print out work...
and if you can get it done by 2 full day work
the price of RM 550 should be reasonable for a freelancer.
One thing about freelancer charges, it should be cheaper than those professional with companies attached.
first, your overhead charges are lower, you only spend your time on the PC plus some electricity bills...

and if you are only going to just burn on the CD to pass the final works to him, you only had additional RM 1 or less for the CD cost...
unless, you need to print them out for him, then you have to add those cost for the papers and inks....
probably, its time you should come up with a graph...
your time - how much time u spend on working on that thing = ur pay
cost involves - what things you used that involves in getting the final work done
that should helps you give better quotation.
and lastly,
even if he is related to you. But if your price is good and reliable,
think that there would be more contacts coming your way = more $$$
words spreads by mouth.
Imagine your uncle having some mamak session with his friends, and his friends tells him about some works he needs drawing done. And then they your uncle tells him how much u charge. And you were way cheaper than the one he is getting from some one else...
then, voila ! you got a new contact coming your way...
thats how business grow...