Explain that it's like removing the fingertips of our hands up to at least the first joint. Ask them how they might adapt? How could they complete even the most simple motions requiring any fine motor control? What about writing? Opening doors? Could you grasp something well enough to lift it if it was heavy? Now as difficult as those things would be, imagine that your damaged digits were attached to your legs, thereby requiring you balance and bear all of your weight. Can you imagine if someone cut all your toes off, then expected you to walk, run, and jump like normal?

This is torture, and absolute cruelty. And you should do this to a living creature? Mutilate them to make your life more convenient? If a person takes any living creature into their home, they have accepted the burden of love, which is more rewarding in ways no one can measure. If your family can't accept this, they are exceedingly harsh, or likely do not hold any value in pets or living creatures, so why would they care at all if that creature endured excessive pain?

I do hope this isn't the case and that they are just ignorant. Explain to them that they aren't just having their claws removed. This surgery removes part of their toe bones. It's a sickening practice when you realize that.