Can grandparents and biological parents obtain joint legal custody of a child?

That type of joint custody arrangement will only work if it has consented to by everyone. It is highly unlikely that a judge will grant it otherwise.

The laws apply where you file for divorce if you meet the jurisdictional requirements.

Husband filed a motion to vacate the default divorce hearing. What happens here? What comes next?

It’ll vacate the default and start the case over.

Divorce - Modification of Life Insurance Amount

It doesn’t seem likely although your case has merit.

Can my son leave to another state and file custody for his children

Yes if he meets the requirements for filing.

If father wins primary custody and majority time, will he still need to pay NCP child support?

No because of the change in custody.

You should stay true to your terms.

HOW SOON AFTER I LEFT MY HUSBAND CAN I EXPECT SOME RELIEF / ALIMONY

You should get into court right away because it takes 30 days for hearing.

My son has temporary custody of his son, and has had it for over a year. What rights does his ex have for visitation?

Under New Jersey law both parents have equal rights. Your son should get into court to formalize what is been going on.

Can my ex file a motion in family court to attain full custody if our divorce agreement requires us to first seek mediation?

Yes if there are emergencies. No if there aren’t.