Comment by Udo
Yes, skip would be good, but I'd also advocate an option like "I reject the premise of the question".
In legal contexts yes-or-no answers can work because the case can in theory be boiled down to guilty or not. If there is any flaw with the case, the answer should be not guilty.
But let's take the "do I have a moral duty to..." questions used as examples here for contrast. I'd argue you never had a moral duty to attend your sibling's wedding to begin with. But because the question was asked with a weird modifier like "even if it's their 3rd wedding", any answer you give will be inadequate and will just serve to reinforce the flawed premise. Skipping is not enough in my opinion, because even if communicated to the question asker, it doesn't make it clear whether there as an issue on the answerer's side ("I don't know" / "don't feel qualified") or with the question itself.
These aren't even yes or no questions. I got several where the two options where either "Yes" or "Also, Yes" and "No" or "Also, No"