1. if you want to become PR, check the possibilities of the PR economic streams.
2. A main applicant can also add to their application dependants (spouse and children below 21 years old).
3. Later on once immigrated you can join the lottery to sponsor your parents or grand parents. Since it is a lottery it might or might not happen
4. You cannot sponsor other family members (like adult children, siblings, cousins, aunt or uncles).
Good luck