Reputation: 35No can do, when you download + install the game it only works for that account. Once you log into the other one, it'll say:Easiest solution I believe would be:
Log in to his account on your computer. From there, you can download all games that are registered to the account. Thus, you can download the games you want onto your computer and play them.
(Game) Pre-Load complete
If you try to load it, it'll take you to the store to purchase it for that account. Unless there's means of getting past that... (I don't know any.)
Well my Dad bought it from the store.. not from STEAM itself...
Can i just use the same CD key as i am not playing online with it..?
Heeeeey Theeeeere
Reputation: 35Well regardless if you need to enter the key (Using same key twice wont work), install and run the game THROUGH steam it wont work.
The only thing I can think of, is looking around for a No-Steam patch for those games you named, then it would work. (Only for single player) (Also I don't know where to find No-Steam crap, and if you do try to venture in this, I suggest you look out for viruses and such.)
There might be other solutions too other than No-Steam, try looking around on Google or something.
Set steam to run offline. Then you can play any non-multiplayer games on your computer and your dad with the real account can do whatever he wants.
Reputation: 43Your only choice is to play with your dad's account, buy them again or download them (Pacsteam works)