Are you suggesting that Bush and Reagan didn’t work “on vacation”?
They surely did, and for all we can tell, much more than Obama.
Anyhow, when a family like Sarah’s and Todd’s gets to move into the White House (Todd would be First Laddie if Sarah were president) that’s where they live. With the kids. Servants are no problem. Baby sitters are no problem. Food shopping is not a problem. There would be lots of time for both parents with the children, understanding that Sarah might be called off for an emergency at any time. The kids can all go on Air Force One when Sarah travels; it’s big enough. I just don’t see the presidency as a serious risk to her family.