My deceased father appointed his sister beneficiary of his 401 k ?but told me get her death cert so she could get me my money

If the sister is named as the P.O.D. on the 401K, then there is nothing that you can do.

What happens to my conditional green card if I divorce and move out now?

I believe that any matter concerning domestic violence will not affect your green card status.

Enforce annulment of marriage in a different country

You need to talk to an attorney in Columbia.

Are family members entitled to any of our property and how do you stop them?

No. You have first rights to what was purchased during the marriage. As to what he may have acquired before the marraige, that would be his...

Can I contest will that I was suppose to be in and the never let me know she died or when or where or see or know anything about

People make allegations based on wrong information. Talk to a probate attorney.

How can I find out if my ex-wife's boyfriend has a drivers license?

Write your ex wife and demand proof. If she won['t produce it, then file an RFO

What is the process for a Guardian as Litem to be appointed over an adult who already has a legal POA (dual)?

When a court signs off on orders, yes it is "legal". You need help from your own attorney. There are some holes here that need filling as to...

File motion with court compelling an accounting of the funds.

My brother filed an F4 petition on my behalf and i am still single. Will it have any effect if i get married by next year?

You are best served by seeking help from an immigration attorney.

You need a conservatorship to "speak" for him but you can't legally represent him.