Yes. There is no limit to the number of guardians a child can have. However, it is not common to have a large number of guardians, as that can get complicated.
The Family Law Act sets out who is automatically the guardian of a child. This is called being a “guardian by statute.” When a child’s biological or adoptive parents live together, both parents have guardianship. If the parents separate, both parents continue to be guardians unless they agree to change this, or a court orders a change.
Someone who is not a guardian by statute may still be able to become a guardian. However, they must get a court order that appoints them as a guardian.