Ask HN: Brothers (/sisters) as co-founders?

Does anyone have experience with this? From a financier's standpoint, is it a good thing to have one's own brother (or sister, as the case may be) involved in a venture?

I figure, on the one hand the brother can't really bail (and you can't really bail) since you can't "escape your own blood". So when times get rough, the probability is high the core team will stick through. But there's also another saying, by which you "can't choose your family but you can choose your friends".

Whether you can make it work or not probably really depends on your specific family bonds and compatibility. But from a purely outsider's perspective, is a brother-brother venture perceived as more risky or less risky than "normal" co-founderships#?

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# Not sure this is even an English word but I suppose it's clear what I mean to say.