Etiquettes

Q: Can you please let me know the adab and sunnah of letters? For example, letter writing and receiving letters.

Q: If I do something like drop a family members toothbrush or have it accidentally touch something like the wall or my hair, but I clean it, am I obliged to still tell them what happened? I dont want to because I know they wont like that it had happened.

Q: I heard that its better to give money or pay somebody with your left hand and when you receive, its better to use the right hand. Is there anything like this in Islam?

Q: Is sitting cross legged permissible? 

Q:

1. Is it permissible to stretch one's legs in front when elders are sitting in front?

2. Is it permissible to jump over one's parents to reach the other side when one's parents are sleeping? 

Q: Can we put mobile or landline phone on loudspeaker when we are talking to someone and many other people are sitting nearby. Is it allowed or not?

Q: Is keeping the feet towards the qibla sinful? In hajj many people keep their feet towards the qibla and sit there or recite Quran like this.

If someone has to read salah lying on the bed, doesn't he have to keep his feet towards qibla?

At the place of weekly talim I always have to sit at tashahud position keeping my back towards the qibla as the seating arrangement is like this, so many of our feet is towards the qibla. Do I suggest to them to change the arrangements? 

Q: Someone mentioned that when one yawns then this is from Shaytaan and one should recite ta'awwuz.

1. Is this correct, and applicable all the time?

2. Should one recite أعوذ... Every time one yawns

3. Is there mention of this in the hadith, and what is the hadith.

4. Similarly with regards to yawning softly without making a noise, is this mentioned in hadith?

Q: If someone compares me to Yazeed when I did't fetch him water, what should be my response to him? 

Q: Is it permissible for one to face his legs in the direction of the Qiblah?