Three questions must be distinguished:
1. Literal fatherhood is impossible here.
2. A figurative use of the expression may be considered.
3. Whether that use produces emancipation is the precise legal disagreement.
Abu Hanifa allows a related substitute at the level of words. The companions impose a different condition when considering substitution at the level of legal effect, producing a different outcome. A responsible account preserves the disagreement itself rather than collapsing it into one rule.