Can my boyfriends wife get alimony from him if they have been separated since June 2018?

Yes she could. Depends upon the financial issues in the case including his and her incomes, length of the marriage, etc.

Do i still pat y child support arrears if child is 25 years old

There is no statute of limitation on child support. If they are emancipated you should file a motion to terminate support. But arrears remain. ...

My wife's sons biological father has been out of the picture since her son was born ?

If your facts are true she can probably obtain that relief. But she’ll need to find him so he can be served notice of the application.

Can I leave state when I have sole custody without prejudice?

You cannot unless you obtain a court order permitting it.

What is sole custody without prejudice?

It is never granted in NJ unless there are serious issues with one parent.

What are my rights in having my child while my ex is away on vacation during their parenting time, if any?

Children should be with you. You need to get a right of first refusal in your custody order.

Will judge see ex's living arrangement non conducive as a positive situation for our child?

Unlikely that a judge will see this as a reason to change the current arrangement.

The court would certainly require him to obtain car insurance while driving the children.

My 37 yr old daughter wants to move my 13 yr old grandson to New Hampshire with her new boy friend . My daughter is unstable

If the father doesn’t object, I don’t think you have any standing to stop her, unless you obtained a court order granting you custody of the child.

She would have to file a partition proceeding in Chancery Court.