Dear client,
An unmarried daughter can claim her parents' pension if there is a legal provision for it in the country where they live. However, this would typically be limited to specific circumstances, such as the daughter being financially dependent on the parents and unable to support herself. Maintenance from parents would generally be considered if the daughter is in need and unable to support herself.
An unmarried sister does not automatically have a right to claim her brother's salary or assets. This would typically be determined by the laws of inheritance in the country where they live, as well as any agreements or arrangements made between the siblings and their parents. It is possible that the sister could seek maintenance from her brother if she is in need and unable to support herself, but this would again depend on the laws of the country.
An unmarried sister could assert her rights through legal means if she feels that her rights are being violated. However, it is important to understand that this would depend on the specific circumstances and the laws of the country where they live.
It is always advisable to seek the advice of a qualified legal professional to understand one's rights and obligations in such situations.