Basically there is somth wrong about the ages. Mr and mrs mason says that 2 years ago their 8 years old boy died. 8+2= 10. How come its the same age as ray? Coincidence?
Then as amine said who the hell waters the plant at 9pm?
Okay adrian has a spare key of the Parker's house.
No physiqual abduction seemed possible since no noises were heard as someone said the teddy bear most probably. But why? What is the purpose of adrian? "He seems familiar" , and the one who crashed the mason's car "smiled". Pedophile psychopath maybe?
Again who would water plants at 9PM? To be honest i dont mean to judge anyone but i won't trust a guy with plants as " friends" looks like a freak to me.
EDIT: the Parkers were having "problems". I believe that the problems are the key to this solution. Andrew mentioned that they lived happily ever after? Wtf whats your definition of happily
@Andrew` xD
How the hell did adrian know that they've always wanted a kid after the accident? Since the masons barerly knows this adrian.
Although all evidences are against adrian i have a feeling he will turn out innocent.
Then there is the animals footprints no one mentionned that because it is hard to find a link between all these clues and the animal footprints.
Come to think about it now The shovel was used for both bury and hiding evidence.
I dont get it what shovel ?

i read the case over 10 times no one mentioned any shovel shown.
Conclusion: the kid is either burried in the place surrounded by trees ( which will be too obvious)
Or the Masons are hiding somth.