בס"ד
That's too bad Hitler didn't know this!
Well, now that I know that you have converted to Judaism, I understand where that comment is coming from. You would like there to be no such a thing as Jewish blood. But Judaism is not like other religions. It is both a religion and a race.
I was born Jewish.
There is no such thing as Jewish blood since "blood" means a "blood of a race".
1.) There are no such things as "races". I don't believe in it.
2.) Judaism is not a religion, and not a race, it's a nation and Orach Chaim, Even Ha'ezer, Choshen Mishpat and Yoreh De'ah.
You can call Christianity and Islam religions, but NOT Judaism.
Also, canceling the children' Jewishness is completely Islamic way of thinking (since their father is not Jewish, and even an Arab, what does it have to do with the kids' Jewishness? the Jewishness is determined by the mother, not by the father).
You're not the one to denounce their Jewishess, it doesn't matter if their father is an Arab or an alien.