What is the standard alimony amount and settlement discussion process?

I am a salaried person earning 32 lakhs per annum. My mother and brother live in Mavli, a small town near Udaipur, and own a house in my mother's name. My mother is a housewife, and my brother works in a nearby mine, earning 8 lakhs per annum. My father is a government officer earning 25 lakhs per annum and will retire in March 2026. My wife is educated, holds an MBA, and works, earning around 5 lakhs per annum. Her family lives in Ajmer and owns a house. Her father is a retired government officer receiving a pension, her mother is a housewife, and her younger brother works in Mumbai with an annual package of 22 lakhs. Now, I want to know what is a standard alimony or settlement amount I should offer to my wife. Also, how should the discussion between both families take place so we can settle on a nominal amount?