Irish folklore fairy movie sci-fi that was on Netflix

Hopefully someone can help me find this film

Saw it about a year or two ago on Netflix. The story was about a family who moved to somewhere in Ireland. The farther may have been a down on his lick author or something and that’s the reason for the move. The locals are warning them not to be there. They have a young child who gets abducted by creatures I believe they called them fairies but they looked sort of like trolls. The kid is returned but the parents don’t think it’s their son and he’s been replaced. In the end they get the son back but at the cost of the farther turning into one of the creatures and fighting the others.