Jamaat Salaah and Imaamat

Q: Can you tell me please in gulf countries I see mostly the Imams finish salaah only with one salam. Is this ok or not?

Q: A Muqtadi has recited an even number of Tasbeeh in Ruku or Sajdah. Before he can recite the next Tasbeeh, to make it an odd number, the Imaam makes the Takbeer. Is the Muqtadi permitted to recite one more Tasbeeh (in order to make it an odd number) after the Imaam has said the Takbeer?

Q: The following categories of Muqtadis are present for a Jamaat Salaat: Mature males, Immature males, Mature females and Immature females. What will be the order in which the sufoof (rows) are arranged?

Q: If a person is busy reading Salaah alone, then another person comes and joins him to make jamaat. Is this action ok? What should the first person do in this case?

Q: A person I know came with me to the Friday prayers. He is not very knowledgeable in Fiqh like myself and we are both non-Aalims. I got out and my companion went to park, but time was running short already, so I managed to find a space, but wasn't sure whether my companion got there on-time. Anyway, I prayed and finished the namaaz. When I got towards the back row I noticed my companion, he pulled me to the side and he was concerned if his prayer was valid, he explained to me the following situation: He came and the Jamaat rose for the 2nd rak'ah, he joined them in the 2nd rak'ah. So when they went into Tashahhud and my companion got up before the Imaam made tasleem, either out of forgetfulness or ignorance, and he quickly managed to finish his final rak'ah and apparently still managed to say the tasleem with the Imaam. He didn't do two prostrations of forgetfulness either. If he neglected to say the Tashahhud out of ignorance as well, would that affect the verdict? What is the verdict anyway?

Q: If you join the jamaat in the last rakaat while the imaam is in tashahud, is your salaat valid or is it preferable to read alone?

Q: If I join Zuhr Salaah behind the Imaam after 3 rakaats, what is the correct procedure to join and complete the Salaah? What should I recite after standing up after the Imaam has made salaam? Surah Fatiha only ? Surah Fatiha and a Surah?

Q: Is it permissible for a mother and son to perform Salaah together in Jamaat? If so, where should the mother stand and is it necessary for the mother to give the iqaamah?

Q: Should the Imaam turn towards his right or left facing the muqtadis for making duaa only for Fajr and Asr Salaah?

Q: How should na-baaligh children be arranged in the suffs of the Masjid during Salaah?