Your kitties are not being bad... they are being normal healthy, mature (un-neutered) male cats! They will fight all the time and possibly hurt eachother if they aren't neutered soon! Please ask your dad to have them neutered soon! Also, they will tend to want to roam the neighborhood, and will produce pregnant females with kittens who may not get good homes. Male cats also spray very strong (smelly) urine to mark their territory. You will have this odor all over your house if they start spraying! The sooner they are neutered the better for everyone!

GOOD LUCK getting Dad to agree!!!