Sentence 1: Robbie's parents were divorced. 
 Sentence 3: When they announced they'd be getting married, Robbie was upset 
 Sentence 4:  His mom went through with the wedding anyways 
 Sentence 5:  After the wedding, he convinced his dad to let him move in with him 
 Option 1: He did not like his mom's boyfriend. 
 Option 2: He did not like his dad's boyfriend.