Yes they can until there is a court order for custody and visitation
The spouse cannot refuse visitation, however the courts can.
Only the court can deny rights, the mother can not.
Only the court has the power to deny visitation rights.
I assume it's not the step parent that is granted visitation. This is something the step parent and spouse have to work out since it's the spouse who has asked for visitation and therefor it's her responsibility to make it work. If the step parent own the house he can choose who's in it and who is not and same goes for the spouse if she owns it. The step parent have no authority over the visitation order.
Not unless there is a court order in place addressing visitation. Each parent has as much right to the child as the other parent. If there are abuse or neglect allegations, the parent denying visitation for those reasons and to protect the child need to report those allegations to law enforcment and DHR/DCS immediately and seek an Ex Parte order for custody pending the divorce.
Equal rights and access see link
ofcourse!
No. The non-custodial parent needs to have the visitation rights enforced by the court if necessary.
no see links below
Age 18see link
no, see link
Visit the court that issued the visitation order and request help from that court.