Is it possible to get an adoption vacated based on fraud?

This is a complex fact pattern, you would be well served to speak with an attorney well versed in your state's adoption laws.

Can i be in any way involved in fraud

I also do not see any crime here based on your description of the event.

Is this food stamp fraud

Could be a problem if you were supposed to report any changes in household composition and you did not do so deliberately.

It may or may not be illegal but the credit card holder is the one ultimately will get stuck with the bill if there is a problem.

Master hearing for removal proceedings because fraud documents

Yes, you should hire an immigration attorney if you are able to.

I may be a victim of investment scam, I have not been paid two payments owed to me

Depends on the circumstances of the "investment." If they are offering some high rate of interest, could be a scam.

I agree with the others, this is something an attorney can really help you with.

Could my friend serve time for welfare fraud? Should she seek legal assistance

Maybe but it could also be treated as an overpayment or simply unsubstantiated.

My sister is accused of welfare fraud she owes 8thousand to the welfre all her income tax was taken away for 2 years

Not clear what income tax has to do with this.

What action can I take against my husband for possible credit card fraud against me

This is going to depend if you are still married, separated or divorced. Your first step is to check your credit report for any unusual activity...