– I watched this movie on an Emirates flight in 2018
– European movie, maybe Scandinavian, in a European/Scandinavian language
– Dysfunctional family relationship, one or both of the sisters was estranged or at least didn’t spend much time with the family
– The mum was weird
– I think one of the three (maybe even mother and one daughter) started flirting with one of the staff at the resort
– Honestly can’t remember much more than that

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I deleted the answer of the french film “Dumped”. It is said to be something similar in a european language.