Transmigrated into a short-lived widow? Cold-faced uncle fights for my life

Jiang Mingwei traveled through time and space, and became a cannon fodder widowed sister-in-law who lost her husband early in history, seduced her famous general brother-in-law and was killed by a sword. Jiang Mingwei was in a dilemma. Who would be a good person to travel through time and space? Her husband died at the beginning, and her mistress came to her house with her son to ask for a status. But her mother-in-law was still a grandson slave, and she threw a tantrum and asked her to welcome the mistress in as a co-wife. Even more shameless, she wanted to use her dowry to support her mistress and illegitimate children. It was really outrageous! Take my dowry? Take it! Want to be a co-wife? Ok, I can even give you the position of the main wife! The old witch will give you as a betrothal gift! But why did the brother-in-law who always disliked Jiang Mingwei, the widowed sister-in-law, never agree to it...