Australia tourist visa fund requirements - URGENT

Hi,

I am from India and currently I'm on Austrelian PR and live in Adelaide with my wife. My wife is 3 months pregnant and we want to invite our parents to help us during the pregnany and after delvery.

We were trying to find the fund requirements to support my parents tourist visa application but couldnt find a definate answer.

Can you please help me on below queries?

1. How much funds do I need to maintain if I sponsor my parents? And for how long?
2. How much funds my parents need to show if they decide to self-sponsor? And for how long?

Please help me asap.

Many thanks,
PP