Even if the mothers' immigration statuses were called into question and even if Trump was not married to them at the time of the children's births, all of Trump's children have an American father. Thus, Trump's executive order against birthright citizenship would not affect the statuses of his own children.

Birthright citizenship remains in effect despite recent court decisions and President Donald Trump's executive order

A federal judge in New Hampshire has blocked President Donald Trump’s executive order ending birthright citizenship.