A daughter does not owe the world a public tribute on every anniversary. A son does not need to explain every family decision. A relative does not have to disclose private memories simply because the public knows the name of the person they loved.
The fact that a family member chooses to share a story on one occasion does not mean they have agreed to unlimited access in the future.
A more compassionate approach allows people to speak when they wish and remain silent when they prefer.
It also recognizes that grief can change over time. The way someone remembers a parent at 18 may differ from how they remember that person at 28 or 40. New experiences can change the meaning of old memories, and the need for privacy can become more important as a person develops an independent adult life.
There is no reason for outsiders to demand that those changes be explained publicly.