I started to cover my head in front of male members in my in-laws home . But my brother in law dsn’t care, and enters at sudden, I try to cover it immediately? How can I handle it? If Iam sinful? 2ndly his wife says I should cook for him when she is not at home as she cooks for my husband?
You are not obliged to cook for your brother in law as this is his wife’s job. Likewise, it is not her job to cook for your husband in your absence as you are responsible for looking after your husband and children.
You must ask your husband for a separate accommodation as this is your right in Islam so that you would not have to wear the hijab in your own home 24/7.