21 Below (2009)

On learning that her infant niece, Maya, is dying of a rare disease, newly pregnant Sharon decides she must return home to Buffalo, N.Y., to help out -- but instead, she steps into a hornet's nest of family turmoil. While Maya deteriorates, another crisis erupts when Karen -- Maya's mother -- becomes pregnant with the child of a former gang member in this cinema verité-style portrait of a family on the brink.

Unfortunately the movie 21 Below is not yet available on HBO Max.