Re-entering the US with dual-citizenship?

[wilsonctr]

My parents are currently on vacations somewhere in the US. They are on a B-2 visa and are allowed to stay for several months according to their I-94. They plan to go to Canada to visit other family members for a few weeks and come back to the US to visit me. I told them that re-entering the US that soon with their B-2 might make the boarder officer deny their entrance. So they are wondering whether they could re-enter the US (either by plane or by land) with their UK passport. (They are dual-citizens) Would that be weird to the board officer as they did not have a departure stamp from their home-country on their UK passport?

[immihelp]

I don't see any problem in first visiting US, then visiting Canada and then entering US again.

So many people do that.

That is not the same problem as entering the US multiple times from your home country.