The 43-year-old woman and 48-year-old man, who cannot be named for legal reasons, were found guilty of murder in the New South Wales Supreme Court in April.
The toddler, known as Joseph, died from extensive and horrific injuries to his head and body after months of violent abuse.
The court was told the mother admitted to police that she had thoughts about killing her son because she "just didn't connect with him".
"Don't get me wrong I did love that boy ... but there was a part of me that hated him ... because he looked like his father, because he's his father's child," she told police.
Outside court, the dead child's uncle said he was pleased with the sentences.
"The judge dished out the appropriate punishment, as far as I can see," he said.