When a parent dies, you lose your past;

 when a child dies, you lose your future.

 A wife who loses a husband is called a widow. 

A husband who loses a wife is called a widower.

 A child who loses his parents is called an orphan. 

 ...there is no word for a parent who loses a child, 

that's how awful the loss is

                           Holding on so tight, miss you my love