used to refer to a thing or things belonging to or associated with the speaker and one or more other people previously mentioned or easily identified 我们的;属于我们的 ours was the ugliest house on the block. 我们的房子是街区里最难看的。 this chat of ours is strictly between us. 我们聊的事决不能外传。
用法
There is no need for an apostrophe: the spelling should be ours not our's