I agree with Mr. Quirk's answer. Your question is unclear (I-795 is not a USCIS form) and you definitely have a complicated situation to deal with....

I-751 joint petition pending. But, I just started filing for divorce. Should I write an amendment letter to inform the USCIS?

You should pay for a consultation with an immigration lawyer to review all the details rather than trying to rely on free advice in this forum...

I'm sorry, but your question cannot be answered with the information you've provided.

Yes, he can petition for you, but his incarceration makes the process even harder than it normally is. Remember, he is expected to attend the...

Can I apply for a green card or US citizenship for an adopted non US citizen sibling?

If I understand your question, you want to petition for your sibling, who was adopted by your parents. If your parents legally adopted your sibling...

How? because the police never believe someone who says, "I didn't know." That's why you need to hire a lawyer to help convince the prosecutor that...

All the information is on uscis.gov if you/he chooses to pursue this without a lawyer. IT is confusing and difficult and working with a lawyer is...

Am dominican i have the permanent green card but my dominican passport is expired can i still travel to my country?

no. you need a valid passport to travel.

You need to become a US citizen first. IF you are a citizen before departing, you can continue to collect social security.

You need an approvable reason. Sick family may be good enough, but it depends how sick and if you can demonstrate a close relationship.