I recently went on a museum tour led by a paleontologist. He told us every sample of dermal soft tissue recovered from raptors had feathers. So, the family thing makes a lot of sense.

'Dinosaur' also encompasses several hundred millions of years of land dwelling creatures so the variety of animal is immense. Just look at the variety of bird we have recorded in the last 3000 years. Or how many times crabs have evolved. Multiple evolutions of feathers or types of animal with feathers makes sense.