The US citizen son can petition for parents's green card using Immigration Form I-130. Depending on the USCIS centre and US state where he is filing the time period varies from 6 months to 5 years or more depending on visa availability. If parents are outside US the son can opt for consular processing.
You can get a greencard if a US citizen familiy member, relative or fiancee petition you.
You have a strong enough argument to take action. Contact the people who issued the greencard.
A citizen can petition their parents if the citizen is at least 21.
If you have a greencard, you are eligible to apply for naturalization by yourself in 5 years from the date your greencard was first issued.
Anyone born in the US, regardless of the citizenship of the parents, can elect to be a US citizen.
Sponsor them for a greencard but you would neede your birth certificates and your parents birth and marriage certificates and your naturalization certifiacte,to prove that your are really siblings and that you actually are a US citizen,this might take a while.you might want to consult with an immigration attorney.
Probably not. As long as the person has been a US citizen since birth then they are able to campaign.
Yes. If their mother or father became a US. citizen then legally if they're under 18 they are a citizen.
A person can become a citizen of the US by 1) birth in the US 2) birth abroad to US citizen parents 3) naturalization
If one or more of the parents is a US citizen, the child is a US citizen, regardless of where they are born.
no, because the parents were born before you
It all depends on where he was born