Rick had many relationships through the years, but it was from the last long-term relationship that he contracted HIV. His partner had betrayed him, and did not tell him that he had gotten HIV from one of his occasional partners. Rick didn't find out until he suddenly became deathly ill with flu-like symptoms. He says, "I knew right away what was happening. We had lost too many friends. I knew what it was."
Generally, the elderly parents have done the best they are capable of doing in raising their young children through teens and into adulthood considering the problems in other areas of life that they have faced, but the kids don't always turn out as the parents hoped.