Hi there and
to Talk Budgies!
You've been given the best advice. I can't stress enough how important it is that you never breed those birds again, especially since they are related and above the proper age to do so. If you neglect this advice, you are putting the health of your current birds at risk and jeopardizing potential chicks.
Be sure to look through the links provided above, which include the forum's many Budgie Articles and "stickies" (threads "stuck" to the top of each subform for easy reference) to stay up to date on all the best practices for caring for budgies. If you have any questions after reading through everything, be sure to ask, as we can help.