My perspective:(SPOILERS)
Elvis original goal was to create a relationship with his father, a bond.He arrived and saw wife, a son and a daughter, that gave him mixed feelings of anger, opression, sadness, depression, which fed his violent nature.He saw his original goal being threated, so he began a plan, a vendetta, and the worst type of them, an emotional one, he wanted his father to feel what he has felt, to make his nice little family go through his pain.He began by killing the son, the boy who was fulfilling his role as the son.He got involved with his half-sister to re-create his childhood, he was probably going to dump the child.All to make his father suffer.But.....he changed along the way, he didnt want to cause damage any longer.He felt the only way to prevent the damage he was about to cause, would be by killing.So, he killed the wife and his half-sister.In the end scene, he goes after his father, theres no one else anymore, they can work on their broken relationship, after all, this is all that Elvis wanted.The last line indicates the desire Elvis has for beginning anew and changing his ways.Who knows, he might even follow dad´s footsteps and work for the church.
Eleven is louder than ten
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