Genesis 36-38

Genesis 38:6 says that Judah's firstborn son was evil before the LORD. How evil was he? His father had instigated the sale of his brother Joseph to slave traders. His calloused attitudes showed no concern for the young man's welfare. He was caught up in greed. I wonder if Er was more evil than his father? Perhaps his actions were persistently evil whereas his father acted selfishly less frequently. Perhaps Judah continued to revere the God of his father Israel and Er was godless; accountable to no one. Whatever the difference between father and son the Bible makes it clear that Er was the less favorable before God.
Stuart