I can't speak to the citizenship issues of your family, but as for your knowledge of the 14th Amendment, you are just plainly making things up.

Section 1 of the 14th Amendment: "All persons born or naturalized in the United States, and subject to the jurisdiction thereof, are citizens of the United States and of the state wherein they reside. No state shall make or enforce any law which shall abridge the privileges or immunities of citizens of the United States; nor shall any state deprive any person of life, liberty, or property, without due process of law; nor deny to any person within its jurisdiction the equal protection of the laws."

Seems pretty cut and dried to me. There is no language about citizenship of diplomats or anyone else.

You might not like it, I might not like it, but her kids are citizens. Get over it.