Do you think dating siblings is a bad idea?

Do you think dating siblings is a bad idea?

Is dating siblings a bad idea? Is it a bad idea to date the other, if you were in a serious long term relationship with one, then started dating the other? If the ex hates the idea, but the other sibling is all in, would you go for it?

Updates
11 mo
Just in case anyone is confused for some reason, I am NOT TALKING about your own siblings?!? I am talking about if you chose to date a set of siblings that are literally NOT related to you. Some people seem really confused by this question, so for clarification, there it is.
Do you think dating siblings is a bad idea?
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