I believe this is The Spiderwick Chronicles (2007)
It contains all the elements you describe. A family move into at a country house. One of the children starts to see things before the others, starting in the walls of the house and eventually meets the resident Brownie who is tasked with keeping the house safe. In keeping with some cliches - he is the child most disturbed by the separation of his parents, and the other family members do not believe his stories at first.
They find that the house is under attack by (small) Goblins who are kept out by a magic circle. The goblins are working for a 'big bad' (a troll I think) who is after the 'Field Guide' of Arthur Spiderwick, an ancestor of the family. The field guide documents all the magical creatures, and will make the 'big bad' all powerful.
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