Parents now under undue influence, duress, by another relative begging for their money
You have not provided enough information. If your parents are incapacitated, then you can report this to APS. You could also petition to become guardians/conservators. You do not have a legal right to an "early inheritance," however, or any inheritance at all, for that matter. So it is possible that you may not be able to achieve your objectives.
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Estate Planning Attorney
This situation is not clearly explained. If you have an issue in S. Jersey I am a licensed attorney in New Jersey with an office in Turnersville.
This is not legal advice nor intended to create an attorney-client relationship. The information provided here is informational in nature only. This attorney may not be licensed in the jurisdiction which you have a question about so the answer could be only general in nature. Visit Steve Zelinger's website: http://www.stevenzelinger.com/
Elder Law Attorney
Although your question isn't very clear regarding what you refer to as a "monthly early inheritance,", if you think that your parents are being exploited or abused, you should contact Adult Protective Services.