Can I date my ex girlfriend's sister?

jackwashere
This girl, Katie, and I started dating in January. We dated for about two months, and then I found her starting to get kind of annoying. Anyway, we broke up after two months of dating. I had known her sister, Kelli, for awhile, but never really talked to her. These past few weeks Kelli and I have been talking and hanging out, and I'm starting to really like her. She and her sister are total opposites. Katie is obsessed with her hair and her appearance. Kelli cares about her appearance, but is more concerned with her grades and her future, and that's the kind of girl I'm looking for. I do want to date Kelli, but I don't know if that would tear her and her sister apart. I don't want to cause their family trouble. Any ideas?
Updates
+1 y
The first sister and I didn't have an incredibly serious relationship. We never said I love you. We never went farther than kissing. We eventually realized we obviously weren't supposed to be together. So we broke up.
Can I date my ex girlfriend's sister?
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