Does the ruling on a woman's 'awrah in relation to other women apply to one's mother and sisters, such that they should not see a certain part of my body?

There is no difference between a close relative and a distant one regarding the limits of a woman's awrah (intimate parts) in front of another Muslim woman. What is not permissible for a distant woman to see is also not permissible for a close relative to see. The limit of the awrah is between the navel and the knee, according to the majority of scholars, based on the Prophet's (peace be upon him) saying: "And a woman should not look at the awrah of another woman." It is permissible to expose any part of the body other than that.