Some states may allow for it, but with that specific set of circumstances, the answer would be no in Texas (and I would imagine most states).
The baby's grandparents could get custody.
The grandparents can get access towards there grandchildren by the mother and father dies and they get them. Or the grandparents file for custody of the children
No. Only the grandparents who have custody over you can give you consent to do so. And even then, they may not be able to give you permission to live with your other grandparents, depending on why you other grandparents were not given custody over you in the first place.
No. If your mother has sole legal custody she can consent to your getting married.
Yeah, they have several of the same rights.
As an illegal, he probably does not have access to the legal system. The grandparents should probably determine if the father is a fit parent and, if so, do the right thing.
They have no court standing
If you are not married the custody automatically falls on the mother and the father have to go to court to get visitation or custody. If you are married you have equal rights.
The childs' father, married or not. Your relationship to the father is irrelevent. The father is the first on a long list of family members. Create a living will if that is not acceptable.
Do you have a court order saying you have visitation? Are you the biological father? If so then YES. Go back to court and file for custody.
No, if they are married they have equal custody.
can try, but they would not have standing