Later, Rhodes asked the child to stab him in the back of the shoulder before cutting the child himself on the arm.
In police interviews, the pair claimed Mrs Rhodes had swung a knife at the child and attacked her husband.
Rhodes claimed he fatally injured his wife while defending himself in the fight that ensued.
The child was under 10-years-old at the time, and therefore bears no criminal responsibility for the attack.
They revealed the truth of the attacks to their therapist in 2021, who reported this to the police.
Surrey Police Det Ch Insp Kimbal Edy, told BBC South East: “Dawn’s character was essentially dragged through the mud.
“Dawn Rhodes was a victim of murder and the child is a victim who was groomed and manipulated to do the things they have told us that they did.
“He has shown a high level of malevolence, manipulation, and I would go so far as to say evil.”