I don't know - I have always assumed that Tom and Carl were a couple, not partners who've found relationships with non-wizards to be impossible. I don't suppose DD will ever clarify that, either.
Either way, they kind of serve as an example to Kit and Nita of how wizard partners can come out "in the end." After all, even if they don't get together, no doubt they will stay close to each other. Each loves the other in their own way.
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