I have been teaching my toddler Bengali and it's hard going. His mother has been trying but struggling to learn it. Much of the time if I say something to him I

I have been teaching my toddler Bengali and it's hard going. His mother has been trying but struggling to learn it. Much of the time if I say something to him I need others to understand what I'm saying too, so I have to revert English. Recently I've started to refuse to give him what he wants unless he asks in Bengali (and helping him to do that). Exactly because I want him to be able to speak as well as understand. My goal is to make him bilingual, as I believe that will help with further language acquisition in the future. It seems really obvious to me that his mother struggles with this _because_ she's monolingual. I'm getting used to it but it's taken a couple of years of very conscious effort to get this far.