Can my kids travel to Jamaica west indies with their I 551 and re-enter to the Unites?

I think you're talking about a 551 stamp. The key is the expiration date 551.

You forgot to tell us their nationality and what Consulate took the application.

Should I apply before 02/24 for AOS?

No fee increase, no change in minimum income. Talk to an attorney for clarification.

Can I get married to a Nigerian citizen in Nigeria on a tourist visa?

Contact the US Embassy in Nigeria for information: https://ng.usembassy.gov/u-s-citizen-services/

What are the new immigration regulations that will update by 02/24?

You are somewhat correct. The fees do NOT change. The minimum income does NOT change. BUT, people can be accused of having the potential of...

AOS New York, processing office ?

Don't bother trying to check processing times. Those charts are almost always inaccurate. The files are moved around between different offices in...

How long gets to receive i 485 decision after uscis reveive your rfe response??

What did the RFE ask for? It might impact on whether or not a supervisor must review the papers.

Can My father visit the US while in the process of his green card application ?

He can try. But, he shouldn't push his luck ... have a return plane ticket for 1-2 months after arrival.

Can DACA spouse (not eligible for AOS) attend my employment AOS interview?

Work with a lawyer. Most employment cases don't need to prove marriage.

If parents are going through divorce, what documents are needed, when travelling with children overseas?

If you search the internet CBP, or DOS will have a Hague Convention complaint letter. Here is info on one from Canada that should also satisfy...