my son was for Cancer surgery, he was to be out 2-3 weeks. He communicated to his boss throughout. Went in today and was told he was no longer needed

my son works as a Manger for snap on tools, he basically drives and manages a route for another owner. He talked to his boss as this was planned surgery. He was to be out for 2-3 week. at the end of week two he spoke to his boss as his surgery was much more intense than planned. he needed another week and may need help his first week back. He went into work today and his boss said he was no longer needed.