Dummy (2008)

A coming of age drama about two young brothers whose lives are thrown into turmoil when their mother dies suddenly, leaving them to fend for themselves. While Danny loses himself in music, sex and drugs, his younger brother Jack transforms a life size mannequin into a brand new mum for him to talk to. Jack's obsession leads to both comic misunderstandings and bitter antagonism as the pair battle through grief, anger and denial.

Unfortunately the movie Dummy is not yet available on HBO Max.