However, I've discovered an issue with the dataset I'm not sure how to deal with. About a fourth of the participants attended the class with their romantic partner. Although I have individual scores from all participants, I'm sure the couples' scores are related to each other. I think this violates the basic assumption for repeated measures ANOVA that there is no dependency in the scores between participants.

Does this mean that repeated measures ANOVA is out as a viable option, or would it still be permitted since a minority of the scores are related to each other? If repeated measures ANOVA is not appropriate here, what would be an alternative analysis that would allow me to look at change in scores across the three time points?

Any help you can give is much appreciated!