Situations like this are always going to happen in casinos
, husband and wives, brothers and sisters and best friends so you cant realy ask the casino to say they cant play together unless there is suspicion and it happens a few times.
Also at what point would you say soft playing isnt allowed regarding pot odds. In the case above its a no brainer call even if the guy had 14K it would be close decision as 2/1 odds and only costing you 20% of your stack.
SO in everybodys opinion what would the max you would definitley call with any 2 cards with 4 random players and you had 50K.
If the player had 10K would be easy call 6K to win 16K