Not sure you can convince them. You have to remember that they know what it's like to be a parent and everything that entails incl cost. It also costs to adopt usually. You can make a list of why they should consider it and ask them why not. Adopting is very emotional though and they cannot change their minds. It's possible they now that you are older, feel like they have a good balance in life with each other, you and work.
My guess is that you may be in the situation where you have aged out of foster care (or been adopted separately and are now an adult) and your sister is still in the system.
If that's the case, you'll need to do a couple of things
This might not be much, but to get custody, you have to be at least 18 to adopt. The process will take a while if you are 18, single, have a low or no income, or if they review you, and you don't seem fit to be a legal guardian of a minor. You will have to be married, have a decent income, be mature, be responsible, and be loving, and caring to get her faster than normal. Notice that doing this is much like a bear and his or her cub. Recognize that being a parent to the 14 year old will change the way both of you are sisters or brother and sister.
I hope you appreciate my giving in advice, if not...your welcome. May God Bless the 14 year old and who ever she concerns. I myself is only 14.
The parents have to give up their parental rights and you file to adopt the child in the county court house where you reside.
Get a lawyer they will help you with all of this! It the only way I know of to adopt someone you already know.
no, you can't one of the requisites they ask when you adopt is that you must have a stable income and be over 18 (21 in some states).
You need to be of adult age and file in family court. Look on their website for requirements and how to file.
well after the age of 18 it is unlikely for them to be adopted even as a younger sister/brother. You could call her/him your younger sister/brother but it would not be official
In Lakota, a woman calls her younger sister mithan; a man calls his younger sister thankshi
Imouto is for your REAL younger sister and imoutosan for another person's younger sister.
yh she did fight her sister when she was younger
teina-younger sister of a female
because she rocks and she is the younger sister.
he has a younger sister called Megan
Younger sister has no such specific word in hindi. Its just CHOTI BEHEN where CHOTI is younger and BEHEN is sister.
sister = sahodari older sister = chechi younger sister = anujathi
She had one younger sister.
Her Younger Sister was created on 1914-12-15.
Your younger sister will grow if you feed her.