Is it sufficient to free an umm walad as expiation?

Hazrat Tawus says that in the case of zihar, freeing an umm walad will suffice.

Ibrahim also says the same.

It is narrated from Ibrahim in the same manner.

It is narrated in the same manner from Hazrat Hisham.

Hazrat Tawoos says that in the expiation of zihar, freeing an umm walad will not be sufficient.

12644 - (W) (1) (2) From Layth, from Tawus (they said) (3): (The mother) (4) of the child is not sufficient in (zihar) (5).

Imam Zuhri states that in the case of kafarah for zihar, freeing an umm walad will not suffice.

Hasan says that in the case of zihar, freeing an umm walad is not sufficient.

Yunus narrates that Hasan did not consider it permissible to free an umm walad as expiation.

Hazrat Hammad says that freeing an Umm Walad is not sufficient as expiation for Zihar, and Hazrat Hakam says that in my view, it is preferable to free any other slave (and I hope so).

12649 - Al-Hakam said: "Other than it is more beloved to me than it, so I hope."

Ibrahim and Hazrat Sha'bi state that in freeing a slave, freeing an umm walad will not be sufficient.

12651 - Waki‘ narrated to us from Sufyan from Jabir from ‘Amir from ‘Ali who said: An umm al-walad suffices in place of a slave woman (1).