'It has to be her, but not 'her', him'

Rating: 10/10 (23 June 2018)

What does usually people expect from a horror flick?? Loads and loads of silhouette shots, images lurking in the dark, frequented jump-scares with heart pounding background score, Finally a harrowing ghostly figure, What if I say there is a movie that uses a very minimum amount of the above ingredients and still manages to' scare the hell out of you'- here comes Hereditary the best horror movie of the decade.
The only thing that made Classic flicks like The Shining ,Exorcist movies Incomparable is the performances that escalated the 'scary factor' .Hereditary excels with Toni Collette's Spellbinding performance which makes it comparable with the Classics.
This movie is like a jigsaw puzzle scrambled all-over the entire running time of 105minutes, with lots and lots of Easter eggs, So pay attention to every single detail or otherwise you may not be unable to decipher it!!!
---------------------------------------------------------Spoilers ahead------------------------------------------------I am going to use double quotes "" for the Easter eggs that I noticed hidden all along the movie and also I tried to give my best possible explanation.
Hereditary- The movie starts off with funeral of The Grandmother of a family, The family members are as follows a deeply depressed Sleepwalking mother Annie(Toni Collette), A Responsible husband (Steve), A Drug addict teenager son (Peter) and a Completely weird acting daughter (Charlie).
Soon the Family starts experiencing Supernatural weird thing happening around them, The Daughter along with her brother goes to a party gets choked by something unknown, end-up dead with her head bashed up on a post. The mother's grief grows further, finds out it was her son's fault ,Finds a way to communicate with her spiritual daughter which ultimately ends by her husband burned down alive to ashes and herself severing her own head. All this for what ???
"It has to be her, but not 'her', him" this is the puzzles solution. Let me explain-
"The pendant" that granny wore laying dead in her coffin, Toni collette has a similar one around her neck, and the post in which Charlie bashes her head has the exact symbol, Symbol of a cult that's primary motive is to bring the God of Mischief Paimon to a Human body. The Granny with her cult group, the Mysterious guy smiling at the Funeral, The Solacing lady (Joan) , and others performed witchcraft, so that the 2nd child would be "Paimon-(a male God Possess only male body)" but it happens to be a girl (Charlie), That's why Charlie says" Granny always wanted me to be a boy". Any way the Granny breast feeds her(Grand daughter) for the big event(A part of Witch craft I Presume), Soon after her death the proceedings begin, the girls chokes for breath ending up her head completely bashed up by the Cult Symbol engraved post. The solacing lady tricks Annie to perform a witchcraft that will draw the Charlie's (Paimon) spirit towards Peter's body to posses it. Sooner Annie finds out that she got tricked and finds out what's going wrong tries to stay away from Peter to protect him, But it happens anyway- she severs her own head to make the final sacrifice, as soon as peter falls out of the window , Charlie's (Paimon's) spirit possess his body. The phrases uttered by Joan "You didn't kill her" & "She is not gone" obviously makes sense. The Cult members and the sacrificed bodies kneel before him to be crowned as the King."Hail Paimon!!!!"
'It has to be her, but not 'her', him'- 'It has to be Charlie, but not in Charlie's body, Peter's'