no he cant < because what will the parents think and it is also illegal.
No the custodial parent has to have either the courts permission or the non-custodians permission.
Not unless the grandparent is the legal guardian. You need parent's permission to take their children ANYWHERE.
No, a non custodial parent can not take a child out of state without the custodial parents permission. The non custodial parent could be charged with kidnapping if charges are brought against them.
It is against the law for a non custodial parent to take their child out of State (can be considered kidnapping) without the written permission of the custodial parent. If the custodial parent agrees then be sure it is in writing, with the date and signature of the custodial parent and carry it with you during the trip.
Not beyond the terms of her visitation, no.
Yes, as is their custodial right.
If the grandparent likes the child a lot to a point they can do what ever they want to do .