Sentence 1: Tom was supposed to meet his estranged father today. 
 Sentence 3: Today he was introducing his new partner 
 Sentence 4:  When Tom saw them, both men, thing suddenly became clear 
 Sentence 5:  Realizing that his dad was gay changed his entire perspective 
 Option 1: They hadn't seen each other since he had left Tom's mom. 
 Option 2: He hadn't spoke to him since his father had come out as gay.