In the past I could see the children of each set of parents. I can no longer see them. What happened?
Where are you looking, that you do not see each set of parents, and their children listed under them.
In the Family Members section of the individual child, the parents, and the siblings should be visible.
If you are looking in the Pedigree Tree view, you will see only the Preferred Parents, and their children, or the Preferred Spouse and children. You can change them is you would like to view the other set of parents. The article below tells you how.
If we have misunderstood your concern, please let us know specifically where you are looking, and what you want to see.
Did you perhaps accidentally close/minimize the Family Members section on someone's Details page? For example, here's what it looks like if I close every section:
And here's what it looks like if I open them all and scroll down:
You switch between "states" by clicking the triangle at the top left of the section.