Can i cancel my FTB ?

My sons father pays me a figure well above what he is supposed to for child support and i am picking up more hours at work so am in a position to stop SPP so i was thinking about cancelling my SPP. What will centrelink require of me ? Can i still recieve FTB or does that get cancelled aswell ? My son is in daycare so i recieve CCS. I dont understand how it all works