So my children, born in San Diego, California, USA, can never hope to be president due to their status as "half" citizens because their mother legally immigrated here from Ukraine and holds Ukrainian citizenship?
You do realize that this is a laughable assertion and that nobody would buy it?
After 9 years of citizenship, a person can become a United States Senator; after 7 years of citizenship, a person can become a United States Representative. However to be President, you must be a natural born citizen (born of two American citizens on American soil).