This Thanksgiving, make sure your relatives know who's boss. This is not the time of year to let people walk all over you, so if you have to indulge entitled family members who have been nothing but unfriendly to you, you might as well show them that you are not to be messed with anymore. Here , we have a woman who used to be friends with her sister-in-law long before she even dated her future husband. However, once that relationship began, the sister-in-law was never able to give the Redditor…