That would depend on both the restrictions of the insurer and whether or not the parent or person who has legal custody of the child is willing to consent to it or not.
It depends entirely on the grandchild's legal guardian(s). They have control over the affairs of the child, so if the grandparents may or may not be permitted to see their grandchild.
if grandparent adopt grandchild will thesocial security benefits stop.
Biologically, the grandchild is a step-grandchild to the grandparent that had no children. In matters of the heart, however, the grandchild is whatever the grandparent feels it is.
Look at the medical insurance that your grandparents should already have. If that does not cover travel, then, yes buy travel insurance, otherwise it would just simply be a waste of money.
Unless the grandparent is the legal guardian of the grandchild, or if the mother is still a juvenile, the grandparents have absolutely no responsibility to the grandchild.
Yes, but check with an attorney to make sure that they are fit to do so.
The husband of a grandmother is often the grandfather. In general, however, grandparents do not have rights to a grandchild unless the parents are dead or legally incapacitated and the grandparents are the closest competent relatives. Even then, a court must first assign custody to the grandparents, it does not come automatically.
Grandchildren is already the plural form of grandchild.
Yes, genes can be inherited from even great-great-great-great grandparents!
Only with adoption.
Sure. No different then doing it for your kids. But, be aware, YOU could be liable if the Grandchild gets sued in an accident as YOU are the legal owner.
You are the grandchild of your grandfather. If that grandfather had children other than your parent, and that child had a child - that person is your first cousin and also a grandchild of your grandfather. Your first cousins are, by definition, all those who are not your siblings but are also grandchildren of one of your grandparents. Remember that you have two sets of grandparents. Those first cousins who are related to you through one pair of grandparents are not related to your other grandparents at all.