回复：立遗嘱？

You will need to get your mother to write a will first in China and give you a copy. When you claim your share of the house, you can show the copy of the will to the Chinese authority. If there are more beneficiaries in the will, your mother needs to make it clear in the will who will get which part of his/her share from all the properties.

Runan Zhang
Attorney at Law, Tel: [phone], Website at runanzhang.com