List the minor grandson to grandmother, if the apartment is privatized, and one of the parents has it share. You will not require the consent of other owners. Enough to present to the passport guy, the certificate on the property.
You will be able to register a minor grandchild in privatized apartment, which was one of the parents, not the owner, only with the permission of the owners of housing. Even if the grandmother will not be against the owner of apartment and other property owners will oppose this decision, to register her grandson at this address you will not succeed.
List the minor grandson to grandmother, if the apartment is municipal and one of the parents was on this same housing. However, you may not be permitted to register the child, if after the registration area attributable to each tenant housing will be less accounting norms.
You will not be able to register the child to the grandmotherif at least one of the parents is not registered at the same address or has a share in the ownership of this dwelling. In accordance with the current legislation, a child under 14 years may be registered only to one parent.
If a child is left without parents (they died or were deprived of parental rights), the grandmother will have to apply to the guardianship and guardianship for registration of guardianship. After that, she will be able to register a minor grandchild in your living space.
If the grandson is older than 14 years but not yet 18, then write it to grandma at the request of parents, with her consent and with the consent of all co-owners or co-tenants of the apartment where she lives. If the grandchild has reached the age of majority, he is free to choose where to register. But to do it he can only with the consent of other family members written on housing or who are its owners.