Help writing an emotional message

So I struggle with emotional things and cringe when writing or saying them. I am buying my mother a music box for Christmas that plays "somewhere over the rainbow" and there is an option to add a custom engraving on the box. This song is the one that played at my grandfather's funeral and my mother loved him dearly. So I was hoping someone could help me write a short message that is in theme with the song. All I could think of is something like "always with you" but I don't know how effective that is. Any help would be greatly appreciated