How did Willy's adultery affect him & his family throughout Death of a Salesman?

Willy's adultery affects the rest of his life and that of
his eldest son, Biff.

Until the fateful episode in Boston
where Biff finds a woman in his father's room, their relationship was extremely close.
Everyone around them noticed the change that occurred. Linda says in Act
1-

LINDA: What
happened to the love you had for him? You used to be such
pals?

The loss of his son's
respect is a severe torture to Willy. His punishment is to endure the knowledge that his
actions destroyed his relationship with Biff. He has to keep re-living his mistake
through his flashbacks and in the questioning of those around him. Bernard, Charley's
son, clearly outlines that Biff's demise started after the visit to Willy. He makes it
cruelly clear to Willy that he is responsible for his son's lack of
ambition-

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BERNARD: ...I've often thought of how strange it
was that I knew he'd given up his life. What happened in Boston,
Willy?

Biff was devastated to
discover that his father was not what he seemed. The knowledge has damaged both of
them.