Generally not, if the adoption was soon after birth. When a child is adopted, the legal connection between the birth parents and the child is severed completely. Adoption, by its very definition, means the biological parents have given up all their rights and responsibilities as parents to the child. A new legal connection is made between the child and their adoptive parents.
Therefore, an adopted child would not be deemed a "child" of the deceased, so would not qualify by that criterion as an "eligible person" to make a family provision claim.
Birth parents can choose to list their biological children as a beneficiaries in their Will and, in most cases, this would be honoured (provided other family members do not contest the Will or challenge the Will). If you are a biological parent and you are planning to list your biological children as beneficiaries, we recommend you make it very clear in the Will as to what the child is entitled to, how to find the child and where they are located. You should also communicate this to all other beneficiaries, to eliminate the chance of a Will contest or challenge down the track.
There may be some isolated circumstances where an adopted child could contest their birth parents' estate, such as an instance where the adoption occurred some years after birth, though we would need to discuss the specific circumstances to advise further.