Spiritu, all children in the Church are considered "legitimate," in the sense that there is simply no category of illegitimacy or bastardy in Canon Law applying the children.
The parents may have had an illegitimate marriage, but there are no illegitimate children. Not in Canon Law.
38 posted on 03/04/2015 12:22:24 PM PST by Mrs. Don-o
(Save us from the fires of hell; lead all souls to heaven, especially those in most need of Thy mercy)