QUESTION: Will my children be illegitimate if my marriage is annulled?
Answer: NO! This is a grave misconception. The marital status of the parents does not affect the status of the children. All children are created in God's image and have equal status in the church. Neither civil law nor church law considers the children of an annulled marriage illegitimate. Nor does the annulment imply that the children were not the fruit of a genuine human love. Annulment is simply a decision on the circumstances surrounding a marriage that could prevent that marriage from being a sacramental marriage.
http://www.stdanielclarkston.org/annulmnt.htm
Thank you for saying it so much better than I could and providing the link.