Unless you can own the property of the whole family (including all spouses and children of brothers and sisters), the family expenses are not divided (because it is unnecessary), and brothers and sisters should try to sign agreements. Taking losses alone may lead to disputes, and it is difficult to adhere to the initial intention when profits reach a certain level of distribution. Of course, this kind of thing is not absolute. For example, a brother and sister are very strong, with outstanding ability and absolute right to speak and control. When others are completely subordinate, the partnership can be stable, otherwise it is not easy to last.
In order to clarify the rights and obligations of both parties and agree on partnership matters, a partnership contract shall be concluded. During the partnership period, if there are differences and disputes between the two parties, the partnership agreement shall prevail.