sgarecfinders | McKay's love messing with time

I just re-watched Kate & Leopold (because Hugh Jackman is all sorts of scrumptious) and apparently Kate and her brother's last name is McKay. this made me hope that perhaps there is a crossover with the characters being related to Rodney. it makes some sense,besides being American, because they've both messed with the timeline in their own ways.
and Rodney would love being related, even distantly and through marriage, to royalty.

so, help?