Your question covers two issues:
1 – Your father taking things that belong to his work without permission.
2 – Your using this property that your father has brought home.
1 – With regard to your father, it is haraam for him to take something without the permission of its owner, because Allaah says (interpretation of the meaning):
“And eat up not one another’s property unjustly (in any illegal way, e.g. stealing, robbing, deceiving)”
And the Prophet (peace and blessings of Allaah be upon him) said: “It is not permissible for you to take the property of a Muslim except with his consent.” (Narrated by Ahmad, 201172). On this basis, you have to advise your father to return these things to their owner; he will be a sinner unless he does that. If he does not know who the owner is, then he should give them in charity.
2 – With regard to other members of the household apart from your father, it is not permissible for them to use these things, because they have been taken unlawfully, except in cases of necessity where a person fears that he will miss out on some benefit or he fears losing a limb or his life. In this case it is permitted but only as much as is necessary.