Thanks, Gene, for your input. You may be right about "her angel face". On listening again, I also think they may be singing "tottering feet" or "toddling feet" rather than "darling feet", as I had thought. I suppose the version on "Radio Vol 1" is a different recording from the one I have, which is from the Rounder Records disc titled simply "The Blue Sky Boys", 1976 - the words may be clearer on the recording you have. For anyone who might be interested, here's the first verse and chorus as I understand them:

The old family bible holds
In its yellow pages old
A treasure far more dear to me than gold
And I shed a silent tear
Every day as year by year
This treasure grows more precious to my heart

Just a strand from a yellow curl
Brings memories of our girl
An angel here on Earth to me she seemed
But the Master called one day
And took our child away
Now all we have is a strand from a yellow curl