Summarized Fatawaa
• Is it permissible for a guardian(Big brother) to unlawfully stop his sister from getting married ?
If the guardian denies her right in getting married for an unlawful reason, she should go to court in order to settle that matter, and the guardian is considered sinful in this case.
• What is the ruling on having brotherly ties between a strange man and a strange woman, and is the former considered a Mahram(unmarriageable) to the latter?
Such a relation between a strange man and a strange woman is forbidden in Islam because it involves forbidding what Allah has allowed by marriage, and allowing what Allah has forbidden such as looking and the like. Such a relation doesn`t render any act lawful between them, thus they are forbidden to look at each other, have a Khulwah(seclusion), and travel together.
• Should nail polish be removed before making ablution?
Yes, it should be removed because it prevents water from reaching the nails.
• What should the man, whose wife wasn`t on good terms with his mother, do?
Both the mother and the wife have rights on the man in question; therefore, each should be given her rights justly, and he should resort to wisdom to please both of them and make reconciliation.