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I think it is a good idea to split up the visitation in smaller blocks for the first year to allow your son to get used to doing this.
Also, the new wife and grandmother have no visitation rights to your child under the law. If the father is not there, my suggestion is that your son not be sent out there without the parent.
You can agree to whatever you want, and if you can't agree, the judge will do what is in the child's best interest.
I know it is easier said than done, but you have to trust the system. The judge is going to do what is in the child's best interest - botXXXXX XXXXXne. I think you make a reasonable argument that 6 weeks for a 5 year old who has never been away from you is a long time. This is especially true since it has been 3 years since the child has seen the father.
I believe the judge will understand your reservations. I also believe the court will see that you're willing to foster a relationship between your child and the father despite the fact that the father has been away for most of his life.
My advice is not to worry. The judge is going to do what is best for the child.