Sentence 1: Joey had a baby brother. 
 Sentence 3: He taught him different things over the next 10 years 
 Sentence 4:  Joey then left to go to college 
 Sentence 5:  Joey and his brother remain close to this day 
 Option 1: He taught him how to stand and walk. 
 Option 2: He didn't know his baby brother existed until the day he graduated college.