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I would check out Tomley RC on YouTube. He reviews a lot of Ready To Run cars and is a rally fan... I am pretty sure there'll be something reviewed on his channel that fits the bill.
If it doesn't need to be a rally car, have a look at the 1/10th HPI Maverick RTRs, or the 1/16th Traxxas RTRs.
https://www.modelsport.co.uk/product/1332660
On the face of it, these look relatively high performance, but mum or dad can turn the throttle down on the transmitter.
The boychild has asked for an RC rally car for his 5th birthday. Anything ready made out there that is fun to drive, rugged and age appropriate?