You are an US citizen or a Green Card holder.

从中国的同名账号: I hope that you have reported your accounts in Chinese banks on your tax returns and the interest incomes are already listed on your return.  If not, you might get inquiries from IRS.

Your parents, siblings and you are all US citizens or Green Card holders.

从不同名账号汇过来: Your parents or siblings each can give you $15K / year under annual gift tax exclusion in 2019.

Estate: One parent can give you $11.4M with the estate tax exemption, both parents is $22.8M in 2019.

https://www.irs.gov/businesses/small-businesses-self-employed/estate-tax

Your parents and siblings are Chinese citizens, and You are an US citizen or a Green Card holder.

从不同名账号汇过来: You don't need to do anything if the total money per year is under $100k.  If over $100k, you need to just file IRS form 3520 for receiving this gift from your family.  There is no limit on how much you can receive.  The only question is how much they can send you from China?

https://www.irs.gov/forms-pubs/form-3520-annual-return-to-report-transactions-with-foreign-trusts-and-receipt-of-certain-foreign-gifts

Estate:  Your parents can pass all their estate to you without any US tax consequence.