How dysfunctional is the Bundren family in As I Lay Dying?

Just to add to the strong points of the above
response:

Addie is so perverse
in her hatred of Anse that she dislikes all of her children but the "love child" that
she has had with the minister, whom she has ironically named
Jewel.

Anse is degenerate both
in body--hunchbacked with gnarled hands--and soul. In essence, he is sociopathic. He
uses his children, forcing Jewel to give him the beloved horse so that he can obtain
more mules to pull the death-wagon after the others drown, he scrimps on money,
depriving the family of necessities.  Even his promise to his dying wife has a
self-serving motive behind it:  to buy a set of false teeth for
himself.

Darl is profoundly
jealous of his brother Jewel that he tries to separate Jewel from his mother while she
is dying by volunteering him to go with him to obtain lumber for her coffin.  So intent
is he upon not allowing the coffin to make its destination in order to foil his mother's
dying wish that he sets the coffin and the barn it is in on fire.  As he is on the train
to be committed to an asylum, Darl laughs and talks about himself in third
person.

Cash, as already
stated, is preoccupied with his tools.  But, he is so obsessed that he views his family
members as a tool. (How dysfunctional!) He actually names each member of his family with
a tool. 

Dewey Dell is
so ingenuous and crass that she believes that a white powder will cause the abortion she
desires.  When a pharmist tells her to come back in the evening and he will fix her
problem by having intercourse with her as this act will reverse her other act, she
believes him.  Later, she realizes that she has been tricked.  She pushes for Darl to be
committed because she fears that he will reveal her pregnancy to the other family
members.

Vardamann is the
youngest; he does not understand his mother's death.  But, on the journey, Vardamann
grows closer to his brother Darl and feels the loss as Darl is shipped off to the
sanitarium.  Because Vardamann struggles to understand Darl's insanity, he becomes more
humane than the others of the family other than Jewel, who does truly love his
mother.

As also stated by mstultz72,
the family is wounded spiritually and physically after this dysfunctional odyssey of
theirs. Indeed, this is much in contrast to normal funerals which usually unite members
of families.