Song of the Sea movie plot

On a picturesque island in the sea, the little boy Ben and his pregnant mother Bronna spent the last happy and unforgettable night. Soon after, sister Saoirsa was born, but her mother died. Six years later, their father, Connor, never got out of the pain of bereavement. The fanciful Saoirse stumbled upon the beetle left by his mother. She nearly drowned in the sea and eventually caused her grandmother to force the two to die. Take a child away from this island. The siblings could not adapt to life in the city, and they decided to return to their hometown by the sea. On the way, they not only met all kinds of elves, but also avoided and faced the witch who hunted them down. The siblings traveled through the ancient and magical lost world, experienced various adventures on the seabed, and finally revealed the identity of their sister, the seal elves. Know the reason why my mother left without saying goodbye .