Pedigree node life status not loaded from saved JSON

To reproduce:

• Create a new trio

• Add a sibling with a life status other than "alive" or "deceased" (e.g., "miscarried")

• Save the pedigree and close

• The thumbnail will be correct

• Reopen the pedigree

• The life status will be incorrectly set to "alive" for the sibling

• If you save, it will overwrite the original life status, causing data loss