Getting back together after 2.5 years, what's the process with centrelink.

Hi IM's
Well about 2 and a half years ago I ended my relationship with children's father, we have kept it quite civil and he see's the kids nearly everyday. Now a lot of time has past, we have grown, we both have jobs now we feel more equal. Now we have gone out on a few 'family' trips and had a few one on one conversation and such (nothing sexual) and he has suggested that we do counseling together to see if we could get back on track. I am open to the idea and I know my children miss their father and I too miss him, I really hopes it does work out and want to keep it on the 'low' for now the kids don't deserve to have him leave again. Now how do I go by this, I don't even know if this will work out but I want to be honest with centrelink and keep them in the loop, so would I tell them that this may be happening or wait till it does happen. Do I need to tell them that we are doing counseling or get any proof etc.
Our time line is about 6 months if we can work through our issues that he will move in with us and we will be a family again.
So what's the best way to go by this,
Thanks IM's.