Sayyid Ali Hussaini Sistani
Grand Ayatollah Sayyid Ali Husseini Sistani (born 4 August 1930), commonly known as Ayatollah Sistani, is one of the most powerful and influential Twelver Shia Marja in Iraq and the head of many of the hawzahs (seminaries) in Najaf.
If they have shown you a written ijazah of them being able to receive khums from the Marja', or you are of the level of trusting the individual in what they are saying about their receipt and its authority, then that would suffice.
If not, request a receipt from the office.
The requirement of A.U. Seyid Sistani's office is that whenever you give a khums payment, a receipt must be issued from the office.
With prayers for your success.
Thank you for your question. Such meetings are not confirmed.
May you always be successful
It is permissible to place something solid in one's mouth while fasting, for the purpose of cooling down, or naturally creating saliva, as long as it is not swallowed, or taken out and placed back in mouth again.
An example for this is putting a coin in your mouth.
And Allah knows best.
You will be able to find the view here.
The emphasis is that the kafan be of one piece of cloth, and if needed to be sewn, then its own strings should be used. Furthermore, A.U. Seyid Sistani does not completely agree that it is makruh. Please see link.
And Allah knows best.
Most prominent scholars among the students of Ayatullah Sistani or any other Marja' of Taqleed are not announced in public and it depends on the opinions of different leading scholars who evaluate those students and judge who are the most senior among them.
Quran is complete, intact and unchanged. This is the faith of leading Shia scholars including Ayatullah Sistani, Ayatulla Al-Khoei, Shaikh Al-Sadouq, Shaikh Al-Toosi, Sayyed Al-Murtadha, Shaikh Al-Mufeed, Shaikh Al-Tabrasi, Shaikh Kaashif Al-Ghitaa' and thousand of Shia scholars.
There are some Sunni narrations from Umar and Ayisha that Qur'an which is available in our hands is not complete (Saheeh Muslim 1050, Musnad Ahmad 5:132, Al-Mustadrak 4:359, Al-Kashshaaf 3:518 etc), with few weak narrations in few Shia books, but there is no values for such narrations. Our authentic evidence from Ahlul Bayt (AS) is unchallengeable that Qur'an is complete and intact.
They may pray together in one room. The husband has to pray in a position that is ahead of that of the wife.