The old lady husband 1920~1971, her daughter 1951~1969. If it is incest, it is considered that her husband gave birth to the old lady when she was 20 years old. In this case, the old lady gave birth to her daughter when she was 11 years old. If her husband was 16 years old and she gave birth to 15 years old, it is unlikely that this is the case. Her daughter died first, so I think the father refers to the daughter's father and the old woman's husband.
Even if it is incest, I think it should be her stepfather.
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