Re: A question from all of you.
Not this white girl, or any white girl I know.
It’s your MIL and husband’s responsibility to worry about your FIL and his loneliness. It’s seems they are outsourcing this job to you.
You are an adult. A married woman. You need to choose if you are ok with filling this role for your inlaws or not. That’s the only power you have. Stay and deal with the ridiculous demands or leave and start a new life. While I hope your inlaws see the error of their ways and your husband matures- you have zero control over that.