Mama Seeton's whistle

Without even thinking about it,Mama Seeton puckered her lips and whistled. It was not a loud whistle. Or a fancy whistle. Just a simple two-note whistle. When Mama Seeton whistles, her children run home for chocolate cake, hugs, kisses, and shared memories.

But as time passes, they travel farther and farther away from the familiar sound.

Can mama's whistle be heard all over the world, and bring her children home one more time?