Unsure as to whether my feelings on this matter are unreasonable, I'm completely open to hearing the opinions of others.
So, my partner, with whom I'm planning my future (even recently putting a deposit down on a property together), just told me that his ex-wife is spending the night at his house, so as to be on hand to comfort their DD. On the cusp of becoming an adult, in terms of legal age, his DD is understandably upset over a break-up with her first love. Wanting her mum's support, the DD asked his ex-wife to spend the night at my partner's house.
My immediate thought was that this is inappropriate, with my first reaction being that he should have offered to arrange a taxi over to DD's mum's house (only a 10 minute journey away) should she have felt that my partner couldn't give her the emotional comfort/support/advice she needed at the time. My partner said it felt heartless to put DD in a taxi while upset, although I thought that the options of him accompanying her in the taxi before returning home, or putting her sibling (to whom DD is very close) in the taxi with her for emotional support during the short ride, would have negated any appearances of being heartless.
Having a DD of a similar age as well, understanding, too, the complexities of sharing her care with my ex-husband, I still feel like we have the responsibility to guide our children on matters such as inappropriateness or social/emotional etiquette, which teenagers sometimes appear not to have as they navigate these tumultuous years, often with an air of self-centeredness.
Is it unreasonable for me to feel uncomfortable with my partner's ex-wife staying the night in the close quarters of his very small house, given the aforementioned circumstances?