I just met an Israeli woman, who said that she became a widow when her first and only child was five years old.
She said that if it wasn't for her husband having more than one wife, with whom she got along fine and co-raised her child together, she would have ended up in a bad situation. That is all the information I received from her.
My question has nothing to do with whether polygamy is right or wrong, and therefore one can refrain from such answers.
My question is: Is there anything in the Tanakh or Talmud about sister-wives (or better co-wives?) helping raise the child of other sister-wives (or co-wives) upon widowhood (or absence of husband)?
I was not going to ask my question, but I was inspired by this: Is there anything in the Tanakh or Talmud about a woman that raises her children alone?