Say:
"Oh cool, one of my sons did something like that last year."
Think:
"I love both first names and I think James Malcolm sounds nice but I think Rosalind trips up the flow of the name just a bit for me, but not enough that I don't like the name combo. They're both great names.
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"Could we do Friday instead? My kids, Liam Matthias{18}, Ruby Michelle{16}, and Bryan Daniel{14}, are working at the Pumpkin patch that day."