The Question and Answer section for The Glass Menagerie is a great resource to ask questions, find answers, and discuss the novel.
This question is answered in detail on Gradesaver's summary and analysis page for Scene III. I jave provided the direct link below.
Amanda the mother; Tom the narrator and the son; Laura the crippled daughter; Jim the gentleman caller and someone who comes to dinner; the father who left the family years ago and whose portrait hovers over the room in which the family spends...
All I'm finding about Tom in Scene Seven is the breaking of his glass and his reaction to Jim's engagement. Are you sure this question refers to Scene Seven?