AITA for refusing to use my savings to pay my sister-in-law's debt after our wedding?

3 days after our wedding, my wife slid a “family agreement” across the kitchen table and said my separate savings would cover her sister’s debt now that I was “officially one of them.” I did not sign. A week later, her father showed up and started pounding on our door, yelling, “Do you know what your little boundary just cost us?” ---------------🦖D - Stories🦖--------------- #reddit #stories #redditstories