No, they're probably more upset that he'll become a Republican (that is, if the GOP still exists when he becomes eligible to vote).
One can't count on such a thing with the Romneys.
Remember that after evading the draft while his father ran as the anti-war GOP candidate, that in 1979 Mitt Romney left the GOP because of Reagan and in time became a democrat donor, fund raiser and voter before rejoining the GOP after the Reagan/Bush years were over, reregistering GOP in October of 1993, he was still fund raising for Planned Parenthood of course.