Praise be to Allaah.
It should be noted that this taxi which your father
registered in the name of his youngest son -- because of insurance reasons
and so on, and it was not a gift and was not meant to become his property --
is regarded as part of the inheritance in which all the heirs have a share
according to the shar’i system of division.
You have to get rid of the interest/riba by spending it in
the public interest or on charitable causes. It is not permissible to get
rid of it by benefiting from it yourselves, unless you are poor and in need.
In that case it is permissible to take from it according to need, as stated
by some scholars with regard to haraam money after repenting and giving up
the sin. Please see the answer to question number
It is permissible for the one who is getting rid of it to
give it to his poor brothers from whom he would not inherit in the event of
their death, or he may give it to them to pay off their debts. For more
information on that please see the answer to question number
If it was decided that this taxi was the property of all the
heirs and its price was put in the riba-based bank, then this interest
belongs to all the heirs, and each of them may get rid of his share by
giving it to his brothers from whom he will not inherit.
If those who are in need take their share of the interest and
spend it on themselves for education and the like because they are poor and
in need, that is permissible as stated above.
And Allaah knows best.