Who is the Husband of Mother Sheranwali (Durga / Ashtangi) - Durga Puran
Brahm (Kaal) is the Husband of Mother Durga (Ashtangi / Sheranwali).
The picture on the right is from Shrimad Devi Bhagwad (Gitapress Gorakhpur), Third Skand, Page 114-115.
Here Durga has been addressed as Bhawani and Kaal has been addressed as Parm Purush and it clearly says that they live together. It further says that both of them have an inseparable relationship.
Further in Devi Bhagwad Puran, Goddess Durga very clearly speaks about worshipping this Brahm as he is above Brahma, Vishnu and Shiva. Those who have not understood these Vedas and Purans continue to worship Brahma, Vishnu and Shiva and Durga, whereas Supreme God is someone else.
To have full understanding of who is Kaal (Brahm) and how nature was created and what is the position of Brahma, Vishnu and Shiv, please read Creation of Nature.