Sentence 1: My sister in law had an elderly friend, Vera. 
 Sentence 3: A tram is a special medical unit for the disabled 
 Sentence 4:  Vera's husband could not use it, and wanted to sell it 
 Sentence 5:  I was able to sell it on ebay for $1000 
 Option 1: Vera had bought a model train for her husband. 
 Option 2: Vera had bought a tram for her husband.