If the sin involves the rights of another person then what form should repentance take?

Is it permissible to ask the Muslims -when meeting with them- about the state of their faith or their hearts? One of them said to me that this is a matter of the unseen and that it is not appropriate to ask about it.

I have repented. But in my possession are some forbidden things such as musical instruments, cassettes, films, etc. Is it permissible for me to sell them, particularly since they are worth a large amount?

A very common problem seen in youth in western countries is that their parents allow them to indulge in some form of haram in the hope that will stop them from committing worse haram. An example of this is that parents will say that they allow their children to indulge in music in the hope that will stop them from going out with bad people or leaving their home all together. Parents are afraid that if they enforce the law of Allah in their homes, that their children will leave. 

What is Islam's position on this sort of compromise? Some parents also say that they only have the duty to tell their children something is haram, and then their children have to choose for themselves because they are already young adults (i.e. 13 -18 years old and unmarried, living at home). Don't the parents have to forbid haram by all means, or do they just say that is haram and then leave them be? To what extent do parents have to go to forbid their children from haram?

Parents also believe that once their children reach the age of puberty they are no longer responsible for their sins or actions, and so say they will have no sin if they advise their children something is haram and then leave them. Is this true? Or do parents always have the responsibility of forbidding their children from haram, and will they be responsible if they see their children doing haram and just leave them after advising them?

What should one who is informed about the correct direction of the qiblah during a prayer?

could you please advise us about how improve our manners, and raise our children to have good manners? As many of the scholars mentioned, they studied under their teachers for years to learn proper manners. I am very concerned because it seems that we are surrounded by bad examples and role models, and the standards of society are very low. I am a revert to Islam so I was not raised with good Islamic manners. I don't have the knowledge or training to be a very good role model. My childrens TV watching is very restricted, but they still interact with cousins and friends who pick up bad words and attitudes from TV. We also educate our children at home. But as much as we shelter them and instruct them, they seem to pick up some of the attitudes of the greater society. I am torn between whether I should continue trying to remain patient and remind them gently, or I should become more strict to enforce better behavior. We would really appreciate any advice that you could offer.

If a man was praying the sunnah of the fajr [prayer], or other than it, and whilst doing so the [iqaamah for the obligatory] prayer was called, is he required to [promptly] terminate his prayer in order to join the imaam [and congregation] in [the obligatory] prayer, or should he complete his prayer [first]?

How can we prove to non-Muslims that Islam is a tolerant and easy religion?