please help me find these lyrics.

[beth-y-boo]

I can't find the lyrics to this one song. I haven't heard it in awhile, and this song has special meaning to me. The lyrics that I can remember go as followed.....

and then someday, when we're far away, and the miles keep us apart, I will discover, I love my brother, and he'll know it in his heart.

This song is a duet between and guy and a girl. The part I just stated was the girls part. I think some of the guys part goes like this:

and then someday, when we're far away, and the miles keep us apart, I will whisper, I love my sister, and she'll know it in her heart.

If anyone could help me, that be really great and I would really appreciate it!