What is the jurisprudential stance on dealing with the father's ex-wife who exploits her children to obtain aid, and is it necessary to expose her practices to the competent authorities, especially if that could lead to animosity among siblings?

The financial support of an adult brother who has joined the military is not obligatory upon the questioner. The financial support of a young, poor, and needy sister is recommended for her capable brothers, but it is not obligatory upon them because they are not her inheritors. Regarding the stepmother who asks for money beyond her needs, she should be advised through indirect means, and charitable organizations should not be informed about her to avoid severing ties of kinship, which is considered a greater evil. Enjoining good and forbidding evil is not prescribed if it leads to a greater evil.