You can't have a "half-grandmother"! She is either the mother of one of your parents or she is not your grandmother.
Your grandmother's great-granddaughter would be your first cousin once removed. Such a marriage would be legal in most countries of the world, although there might be some states of America that frowned upon it.
It is not legal to marry your own daughter or granddaughter anywhere in the US.
Your mother's mother is your grandmother. Your grandmother's sister, whether elder or younger, is your great aunt. Your great aunt's granddaughter is your second cousin. While some ethnic groups, religious groups, and a few legal jurisdictions do not accept marriages between second cousins, most jurisdictions do permit it. So if you are willing to deal with possible disapproval from some family members, you could marry your great aunt's granddaughter - as long as you are male, or you live in one of the few places where gay marriage is legal.
If he is of legal age
In most places, it is illegal for a grandpa to marry his granddaughter due to laws prohibiting incest and protecting against exploitation.
Yes, if your granddaughter is living with you, and being taken care of by you, then you are her guardian. In other words, being a guardian is not so much a legal status as it is a relationship. If the relationship exists, then you are the guardian.
The mother or father or legal guardian of the sisters. if there is no guardian the sister is next of kin.
You need to consult with an attorney who specializes in evictions. You may need to evict your granddaughter in order to get rid of her boyfriend. You need expert legal advice.
between your grandaughter husband, and you? if you have a granddaughter husband, you may not want to make that public. i don't know if that's legal.
Generally, a grandmother is under no legal obligation to leave property to a granddaughter. You would need to have specific grounds to contest the will as well as legal standing in your jurisdiction. Grounds include such factors as undue influence, improper execution, mental incapacity, fraud and mistake. You should consult with an attorney who specializes in probate.Generally, a grandmother is under no legal obligation to leave property to a granddaughter. You would need to have specific grounds to contest the will as well as legal standing in your jurisdiction. Grounds include such factors as undue influence, improper execution, mental incapacity, fraud and mistake. You should consult with an attorney who specializes in probate.Generally, a grandmother is under no legal obligation to leave property to a granddaughter. You would need to have specific grounds to contest the will as well as legal standing in your jurisdiction. Grounds include such factors as undue influence, improper execution, mental incapacity, fraud and mistake. You should consult with an attorney who specializes in probate.Generally, a grandmother is under no legal obligation to leave property to a granddaughter. You would need to have specific grounds to contest the will as well as legal standing in your jurisdiction. Grounds include such factors as undue influence, improper execution, mental incapacity, fraud and mistake. You should consult with an attorney who specializes in probate.
A grandmother can get custody of a granddaughter by going to court and asking a judge for custody. The grandmother will need to retain legal counsel to file the necessary paperwork in the courts.
File a petition for legal guardianship in the appropriate court in your state. You will either need to do some legal research to find out what needs to go in the petition or you will need to hire an attorney.
When sisters and brothers marry it is called incest and is not a legal marriage in most parts of the world.