That might be what the secular world refers to them as but the Church does not.
Iirc, the children were legally adopted. This makes the Catholic Church’s judgment of the sacramental validity of Tom Cruise’s and Nicole Kidman’s legal marriage even less relevant that it would otherwise be.
RE: the children of Kidman and Cruise - I thought they were adopted. I do not think Nicole Kidman has ever had a biological child - although I recall she claimed she had a miscarriage just after the separation from Cruise.