*continue chewing, tasting the meat even more in my mouth*
"seriously?, wow, its really tasty, to be honest never really ate cat before, is it a custom from your country?" (considering they are from a country that eats cats)
if its not that country change the last part for "you eat cat often?"
there are several possible responses from the mom "yes, its a family recipe" "i was joking" "we are going trough troubled times and have no money for other kind of meat"
whichever is the response, I just tried something different, had a very good conversation topic and knew more about my dear friend than I knew before, doing anything else is really just being an asshole and impolite towards the family that just offered to feed you for free, even more if its because of troubled times, I was raised with a sense of valor, honor, and values that would make it impossible to me to be rude in that kind of situation, hell, I wouldn't have even thought of refusing the invitation in the first place because its a real honor to be treated as part of the family by the mother of my friend the only thing i might have added is a "if it causes you, miss no more trouble or work I don´t see why not", being invited to share their intimate time as a family is one of the greatest things one can offer, and even though I´m not religious I find it sacred in its own way, I am a guest in their house after all, and I value friendship much more over whatever preconceived ideas I might have had towards eating a cat
and yes, I call "miss" to every lady or woman that is older than me by a great margin, always, I am 25 years old, I have a kid, but thats the way I was raised, hell, I call "Sir" to the older people that I have just met, but I am a gentleman to women every single time.
This reminded me of a time where I went to a Christian house to play some Video Games with a friend, I was invited to eat with the family, first thing you have to remember, NEVER be the one to take the first bite, always wait for someone else from the family to start, so they said grace, I respectfully lowered my head and said "amen" with them, after eating my friend called me aside and asked me "why did you said amen at the end? i thought you were not Christian" my reply was simple "I might not be a Christian, but I am in your house and I am not going to disrespect your family with my beliefs, and saying "so be it" to the wish that every other family might have food in their tables and giving thanks for the food we are about to eat is not against my beliefs" (the grace was something along the lines on "thank you for the meal bla bla and may the lest fortunate find their plates full this day")
Just because your beliefs are different than someone else's, that doesn't mean you have to feel entitled in their own house about it... thats how I was raised, as I said before, they are doing a LOT by opening their home to you and entrusting you with their private life.