Most people feel a responsibility to help a close family member if they are going through a hard time. After all, that is what family is supposed to be for, if you listen to what many say. Nonetheless, how you help your family (if at all) and the lengths you will go to do that are heavily dependent on more than just an obligation to be nice. There are many factors to consider.
While it is unfortunate, it can be very common for people to act in entitled ways towards family members. Any reason to take more than they are owed is acted upon. It can be something that is difficult to deal with for those around them, not least if they are in a situation where it looks like the person offering help is suddenly being unreasonable. It can bring a lot of unpleasant relationship dynamics to the forefront.