Old Hamlet is unavailable to him through his death and the complex vulnerability that his death dominates
His father cannot protect him and his absence leaves Hamlet in the domain of the engulfing mother, awakening all the fears incident to the primary mother-child bond - the loss of the father turns out to mean the psychic domination of the mother
In the end, it is the Spector of his mother, not his uncle-father, who paralyses his will
From Janet Adelman's 'Man and Wife is One Flesh'