Om Swami
How can I show love to my parents and keep them in my heart?
Remember your parents, in life and after
When a child calls to wish a parent on their birthday, the parent feels good. If you do not call, they may feel somewhere in their mind that they were not remembered. In the same way, shraddha for ancestors is a way of remembering them.
For example, if it is a parent's birthday and the child calls to say happy birthday Mom or Dad, they feel good.