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There are far more people who have dated the siblings of friends, and ended terribly.
First it depends on your age, and the age of your friend's sister.
Being betrayed by two people you care about has to be one of the worst feelings ever, especially when things are done in an underhanded and sneaky way.
Despite the fact that basic girl code rules say we can’t date our best friend’s ex (unless we have her permission and even then, ), people always do it anyway.
Resisting the situation is not going to make you feel better or change the situation. Your annoyance and frustrations with him are your problem.
If you're in high school, I'd say don't do it.
Very few high school relationships last, or end on good terms (and if your relationship does end/crash and burn, then it's going to impact your relationship with your friend).
Don’t put him down or talk badly about him either to her or to anyone else. If you do that and you keep doing it, you will slowly destroy your relationship with your best friend and I’m sure you don’t want that.
I know that you two have been through a lot together. I Met Someone Online but Don’t Want to Give Him My Number Dear Straight Up!