Praise be to Allaah.
Firstly:
It is not permissible to commit fraud in order to take money
and assistance from the state in the manner that your mother did, because of
what that involves of lying and consuming wealth unlawfully. The burden of
sin applies to the one who does that and the one who calls him to do that,
but there is no sin on you because you were small at that time, then because
you objected to what your mother did. You have to be careful and avoid
taking anything of this money. If your father has halaal wealth that is
mixed with this money, it is permissible for you to eat from his food in the
case of need.
We praise Allah for having enabled you to find work by means
of which you can spend on your own maintenance and you do not need your
father’s maintenance.
Secondly:
You do not have to pay back the government’s money, but you
do have to advise your parents to stop taking it.
Whatever they took before they knew that it is haraam, they
do not have to do anything about, but whatever they took after they learned
that it is haraam, if they cannot give it back to the state, they have to
get rid of it by giving to the poor and needy.
We ask Allah to increase you in knowledge and guidance.
And Allah knows best.