My brother-in-law and his wife moved in with my bf's parents for a few months until they could get back on their feet. They have two small boys and a cat they have had since they were first married.
They looked for an apartment to rent, but could not find one that would allow pets. My mother-in-law was anxious for them to move out, so she told them to take the apartment and she'd keep the cat at her home.
Shortly after, my mother-in-law asked my bf to secretly get rid of it. (Her husband had refused.) When my bf said he couldn't do it, she took matters into her own hands, drove the cat 10 miles away from her house and dumped her on the side of the road.
The kids went to her home every day to set out milk and look for their kitty. They also checked with the local animal shelter. About 10 days later, they found the cat at the shelter. They had to pay to re-adopt her -- money they didn't have to spare. Not knowing what I know, they then returned their cat to her!
Should I tell my brother-in-law the truth so they can rescue their cat, or keep quiet as not to make my mother-in-law angry by revealing the awful thing she did?