✔ 最佳答案
Assume A dies in HK (I am not too sure about the Chinese rule)
According HK Law, if A dies 沒有遺孀!也沒立遺囑, his asset will be distributed equally among his sons and daughters.
For A去世前和排第二的兒子開設聯名户口的錢 (assumes A's signature is need to withdraw money, upon the death of A, the account is frozen, otherwise if second son's is able to take money out on his own, he would have taken money out asap) The second son would have the title to the money(account). However, the other daughters and sons may argue the second son is the trustee (受託管理人)of the money, i.e. without the authority to use the money . Thus the benefit of the money belongs to all 4 people, i.e. the money belongs the 4 people.
For A的私人户口內的金錢, easy, belongs to 4 people.