1. A child born during the time of marriage of parents, but the marriage was annuled later.
2. A child whose birth certificate was personally signed by the father, but is not proved to be his real child. the father is also married to another woman at the child's time of birth.
3. A child born after the voiding of the father's previous marriage, but the father is not married to the mother. The child was also born a few days after the father's death.
is there a possibility that his illigitimate children have been adopted by him to be legitimated, even without the consent of child#1? Thank you in advance for your help.