Sentence 1: Erika wants a new puppy for her birthday. 
 Sentence 3: Her father does not 
 Sentence 4:  The parents discuss it behind closed doors 
 Sentence 5:  They decide Erika can have a puppy if she cares for it herself 
 Option 1: Her mother does not like dogs. 
 Option 2: Her mother thinks it's a great idea.