Many parents worry that telling their kids might place a burden on the children. Mental health professionals say the decision about whether to tell your kids depends on many factors, including how perceptive they are (if there are medicine containers all around, kids will ask about them), how discreet you need to be (asking kids to keep your status a secret is a heavy burden), and how strong you can be for them (some kids will be angry or overly clingy, worried you'll be dying).
For most people, telling their children is the right thing to do. Before you do, learn everything you can about HIV. Your kids have been perfecting the "why" questions since they were 2 years old; this is a moment when there will be a lot of whys and hows.
Your doctor or counselor might have ideas about groups or advocates for children, who can also talk to the kids or be a support team for you and the offspring as you go through the coming-out process. Then, says Mark Cichocki, a nurse educator at the University of Michigan's HIV/AIDS Treatment Program and the author of Living With HIV: A Patient's Guide, talk in a quiet space, be honest, trust your kids to handle it, and let them express their emotions fully (remember, kids can experience a range of feelings, including guilt, fear, rage, and rejection).
This process may take more than one day -- it's the beginning of a conversation in which you should be honest, age-appropriate, and willing to offer both answers and assurances. Kids can impress us with their ability to understand and assimilate information; you just need to have it ready for them. After the crying and talking is done, take them out for ice cream so they remember that this is just another thing that your family will tackle together.