Yes.
Time to audit each person named.
As an extra note...
Americans can own property without dual citizenship, including real estate, in most countries.
Americans can legally have financial accounts outside the US, without being dual citizens, but they must be reported each April 15th on the FBAR form.
Dual citizenship does open doors outside the US to investment opportunities that are not available to Americans otherwise. And it is difficult for most Americans to find a foreign financial institution that will accept them as clients, due to the FATCA requirements that will cost them money.