We have the entire script available for "Charlie Chan's Chance," so you can read the ending. What should certainly spark your memory would be the scene whaere the black cat saves Charlie Chan's life by redirecting the murder weapon toward the person who set up the trap to kill Chan. In this film, there were no offspring. However, a new addition arrives during the course of the movie, which Mr. Chan hears of via a long distance message.
Do you recall viewing this picture in a movie theater sometime during your youth? If so, did you see any other Chan films similarly?