Who in his family does Elie seem most attached to?

This
question is difficult because the circumstances described in are so
horrific that it is impossible for family relationships to be maintained as they are in
"normal" life.

In his hometown of Sighet before the deportations
occur, Eliezer tells us relatively little about his feelings toward his parents and his sisters.
He appears to bond more closely with Moishe the Beadle than with his father, because his chief
interest is religious studies, which Moishe helps him with. About his father, he says,

[He] was a cultured man, rather unsentimental. He rarely displayed
his feelings, not even within his family, and was more involved with the welfare of others than
with that of his own kin.

Yet once the deportees arrive
at Birkenau and the men are separated from the women, Eliezer never sees his mother and his
sisters again. His father is therefore the only family member left to him, so whatever the
closeness had been between the two of them in "normal" life, the two must become close
now because they have no one elseat least no one in their family.

Still, in
the camp, there is nothing to suggest that Eliezer's relationship with his father had not been
close to begin with. Eliezer is shaken when he sees the changes that occur in his father once
the horrors of the camp become obvious:

I glanced over at
my father. How changed he looked! His eyes were veiled. I wanted to tell him something, but I
didn't know what.

Eliezer's statement after his father's
death is, "Free at last!" His father had become a "burden" to him, but this
in no way reflects upon the feelings the two had for each other. It is, rather, an indication of
how the concentration camp has plunged people into a bare struggle for existence. Life has
become a moment-to-moment battle against the odds created by genocidal conditions. Yet in every
respect Eliezer and his father had, in life, kept the bond between them normal for a father and
son. If the relationship between them in Sighet had been a somewhat impersonal and unemotional
one, in the camps it was one of devotion and showed a triumph of the spirit against those forces
calculated to destroy it.