After the news about jim's engagement amanda thinks that laura is at fault because of her disability jim is rude and a self - centered man tom knew about the engagement there is still hope for laura and jimthe book the glass menagerie

TOM KNEW ABOUT THE ENGAGEMENT.

After the news about Jim's engagement, Amanda thinks that TOM KNEW ABOUT THE ENGAGEMENT and has played a joke on Amanda and Laura. Even though Tom insisted about his innocence against the accusation, Amanda still persisted in her accusations and even deemed Tom as selfish and a dreamer. 

This was the last conversation the family had together before Tom went and left to find his way in life.  

The only reason based on my own answer or some of my instinct jack flack up and down and then twist all around before taking his medicine is because the label of his medicine says that you need to shake well before using or before taking it.