Wife is threatening continuously & creating violence at home

I am 32 years Old Man from Pune got married 2 years back & have 1 year Old Son who is suffering from thalassemia. Due my sons diseases its expensive for me to treat I am always under pressures arranging money for his treatment as well as his diseases which is my prime aim. But my wife always create violence at hose by involving my mother. To make her more understanding I always explained her current son situation & asked to cooperate & focus. But she want my mother is reason due to which this is happening . Now since last 1 month she is not at all involving in household stuff only goes to her job & always pressurize for nonsense things. Since last year my mom is taking care of Son as wife was least bothered due to which couple of times son faced medical challenges due to which he is more attached with Mom. So she try to make issue send mom outside home & she want all money in hand which is her indirect intensions. Please suggest how should I can get help as don’t want my old mother trebled more same & want son to be get best treatment but want legal security from wife as she always threat that she will drag us to Police station