人の物も in カードは人の物も使える


From _Liar Game_ chapter 45, this guy got swindled to hand over money to enemy
team and he explained why he did.

[![1](https://i.stack.imgur.com/Y5WTf.png)](https://i.stack.imgur.com/Y5WTf.png)

> 秋山が言ってたじゃないか、カードは人の物も使えるって

I am not sure what「カードは人の物も使える」is supposed to mean. The fan translation
suggests it means "Other people can use your (bank) card." The 人の物も part
throws me off. What is the structure of this sentence? Surprisingly, a quick
google search of this phrase seems to suggest that the translation is valid.

For bit more context, few chapters ago Akiyama explained to the team that
there are many ways to use a bank card in game: players can not only withdraw
money but also deposit money, players can use other player's card, and cards
can be renewed if it is not working.




> カードは人の物も使える

I understand it as...

_lit._ Speaking of cards, (we/you) can use other people's (cards) as well.

人 here means "others" ie "other players".  
The の is the genitive case (possession).  
物 refers to カード.

A similar example from the web:

> 「クレジットカードはご家族のものでもかまいません。」




> カードは人の物も使える

I understand it as...

_lit._ Speaking of cards, (we/you) can use other people's (cards) as well.

人 here means "others" ie "other players".  
The の is the genitive case (possession).  
物 refers to カード.

A similar example from the web:

> 「クレジットカードはご家族のものでもかまいません。」

