Can I bring my relatives with me when I apply for ordinary skilled immigrants in Australia?

You can't apply for immigration together when you apply. You can apply for immigration first, and then apply to your parents after the green card is approved. Simply put, you immigrated to Australia, but your parents didn't. So your parents will come to Australia to reunite with you. As long as 1 person in the family gets a green card, the whole family and your immediate family can get a green card.