Takbeer-e-tahreemah and Qiyaam

Q: If the muqtadi joined the salaah at the time when the qiraat had commenced, then should he recite the thanaa?

Q: Sometimes when I'm offering my salaah, my kids start to argue with each other or start reciting some surah. As a result my attention gets diverted. In this situation I read Allahu akbar (when going into ruku or sajadah) in a bit loud voice to stop them from disturbance. Is this a sin?

Q: Is it compulsory to recite 'wajjahathu wajhiyya...' in the starting of sunnah prayer and "allahumma ighfirlee maa qadhammthu..." in the tashahhud of sunnah prayer.

Q: A man joined the Salaah after the Imaam completed the Surah Faatihah. Should he recite sana? 

Q: If I enter the mosque to offer Maghrib or Esha namaz. I know that the people offering Namaz are in the 1st Rakat but the Imam has already started reciting a Surah from Holy Quran after reciting Surah Fatiha first. In such a situation do I have to say "Sanaa" or shall I keep silent and join the Namaz?

Q: I see that when some people from other countries pray salaah, they touch their toes and keep so much space between the shoulders. Please explain in detail if it is in Hadeeth.

Q: I am offering namaz as a muqtadi in the mosque. I want to know that at the start of the prayer when we say "Allah hu Akbar" do we have to say "Sanna" only or do we have to say "Ta'awwuz" and "Tasmia" as well after the "Allah hu Akbar"?

Q: While reading salah, is it necessary to read thana at the beginning of salaah?

Q: Can we recite sana when joining the Salah while the imaam is reciting a Surah? 

Q:

1. When starting salah, do your hands have to be facing qiblah?

2. Will salah be valid if you start salah with your hands facing inward towards your head? One time my imam for salatul jumuah started salah and I think his hands were facing inward. What should I do in such a situation if my jumuah is invalid and I am going to have to wait for second jumuah or go catch jumuah at another masjid?