Final answer:
The relationship between Fred, Martha, and Saul cannot be determined without additional context, but they may be connected through non-traditional family structures such as step-parenting or adoption as suggested by the provided reference materials.
Step-by-step explanation:
The question 'how are Fred and Martha parents to Saul?' appears to be asking for a connection or relationship in a family dynamic context. Based on the reference materials provided, it seems likely that the answer involves a non-traditional or complex family structure, such as step-parents, adoption, or a similar situation. Unfortunately, without more specific information regarding Fred, Martha, and Saul, it is not possible to determine their exact relationship. Nevertheless, the reference materials include instances of blended families, adoptive parents, and individuals stepping into parental roles under various circumstances, which might suggest that Fred and Martha could be connected to Saul through similar means.