Witr and Nawaafil

Q: Salatul ishraq is the start of salat duha? Like if I pray 2 rakat after 20 mins of sunrise, so it will be considered as both, chasht and ishraq prayer?

Q: With regards to Taraaweeh:

1. An Aayah was recited correctly. The Imaam thereafter repeated the Aayah and changed it (incorrectly) due to some doubt. Is the initial correct recitation or the second recitation which was incorrect taken into consideration? Does the Aayah have to be repeated?

2. For the purpose of listening to the Luqmah of a Saami', the Imaam remained silent for the duration of 3 Subhaanallaah or more (he did not recite Qiraat for that duration). Should Sajdat-us-Sahw be made?

3. Additionally, if a person because of some disturbance missed an Aayah in Surah Faatihah, or one sentence in his At-Tahiyyat, does he have to make Sajdatut-us-Sahw? To what extent is the Surah Faatihah and At-Tahiyyat Waajib? 

Q: What is the manner of offering khusoof prayer?

Q: Can a person sit and read taraweeh without a valid excuse, just because he is feeling tired or his back is paining a bit?

Q: My brother is interested in marrying a specific girl. Can I read istikhara for him since he is already biased towards marrying her?

Q:

1. I wanted to ask you that if salat al tasbeeh was proven in hadith or not?

2. Is salat al ishraq valid even if one sleeps in between fajr and salat al ishraq?

3. And how many rakats should be offered?

Q: Is it allowed to pray nawafil between the sunnats and farz of Du'hr and a'sar?

Q:

1. With regards to the 2 rakaats of nafl salaah of Zuhr, Maghrib and Esha. Is one allowed to make a double intention, e.g.: Nafl of zuhr + taubah?

2. Can I make multiple intentions for tahajjud salaah e.g.: tahajjud + shukr?

Q: I did istikhara for three consecutive days but I am unable to determine what is the outcome of this. I didnt experience any dream at all and neither do I feel my heart inclined to a particular outcome or decision. How to judge what is Allah's suggestion in such a situation? Should I ask someone else to do istekhara for me and believe in the outcome and do accordingly? I did istekhara to seek Allah's suggestion for a marriage proposal.

Q: We carried out an istikhara for my son almost a year ago for a college girl he was interested in. The Aalim said no. My son got very disturbed and heard from someone that istikhara can be repeated after some time. During this year almost, he prayed five times and performed umrah with the family and did istikhara himself and saw himself offering prayer. He says he is satisfied and the answer is yes from Almighty Allah. He only resolves around any option confirming his yes but we the parents still wish to seek guidance. We want some responsible authority to say ok before we take decision. Please help us!!