Anonymous wrote:I wouldn't write "enjoy your night off ... etc"
as its not addressing the issue directly and its rude, frankly.
but you're right the mom doesn't need to be there and the toddler definitely doesn't.
you might be better placed to say "apologies for the confusion, we aren't having siblings this time as its a very small group, you're welcome to pop in for a drink with me in the next room if want to..."
I see two sides on this - probably depends on the personalities and relationships involved. "Enjoy your night off" could be passive aggressive "You're not welcome to stay" and I assume that's what you mean. I could also see it giving the guest's mom a polite exit from an awkward situation. Depending on delivery tone, it could also be quite rude to tell someone flat out "You've made a wrong assumption; you're not welcome to stay." The gentle suggestion to "enjoy the night off" could be just that.
Not trying to change anyone's mind, and I see that OP has already resolved this, but want to point out how important tone can be in delivery.
