What should the questioner do concerning her vow to honor and serve her parents and live with them, taking into consideration that they are divorced and live in separate homes, and that she does not recall her original intention regarding living with them?

Your vow to be dutiful to your parents is not binding, and nothing is required of you concerning it. Rather, you are obligated to be dutiful to them to the best of your ability, seeking Allah's pleasure.

However, if your vow was to live with them to serve them, then this is a vow of a recommended act, and it is binding, and it must be fulfilled. Since your parents are divorced and live in two separate apartments, you must serve and be kind to the one you live with, and be dutiful to the other by whatever means of dutifulness are possible, such as calling them and so forth. This appears to be what you intended.

We draw attention to the fact that a vow contingent on a condition has been disliked by a group of scholars.