Q. My partner has a very cordial relationship with her ex. They adopted a child together and share custody now, so I am with their son quite often.

I have had a strained relationship with my partner’s ex, and something has come up recently that has really thrown me. My partner travels for work and has very little down time. She will not be able to buy a birthday present for their son’s mother, so she has asked me to take their son out to buy the present. This just sounds weird to me and makes me really uncomfortable. What’s good ex-etiquette?

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