Praise be to Allaah.
Firstly:
The one who wants to engage
in some transaction with a company or anyone else must know the rulings on
that, and find out whether it is Islamically acceptable, either by
researching it himself or asking the scholars, as Allaah says
(interpretation of the meaning): “So ask of those who know the Scripture,
if you know not” [al-Nahl 16:43].
If you subscribed to these
bonds following a fatwa issued by a trustworthy scholar which said that they
are permissible, then there is no sin on you.
If a person is sure that
they are haraam, then it is not permissible for him to subscribe to them. If
a person subscribes to them then finds out that they are haraam, then he
must get out of it, and there is no sin on him for what happened in the
past.
You have done well to get
out of it and withdraw your money. This is safer and better.
Secondly:
If your family do not think
that they are haraam, then they do not have to get rid of these bonds,
because they followed the fatwa of one who said they are permissible. If
they are not qualified to know the difference and determine what is more
correct, and they rely on following a scholar whom they trust, there is no
blame on them.
Thirdly:
It is permissible for you
to eat and drink food and drink offered to you by your family, because their
wealth is mixed, and because wealth that is haraam because of the manner in
which it is acquired is haraam only for the one who acquires it and not
others who take it from him by permissible means. See the answer to question
no. 45018.
With regard to your oath,
if you wish you may adhere to it, and not benefit from anything that results
from the profits of these bonds, whilst benefiting from their other wealth,
or if you wish you may offer expiation for breaking your oath.
You only have to offer
expiation once, because the one who swears repeated oaths concerning the
same thing only has to offer expiation once in the event of breaking the
oath. See the answer to question no.
38602.
And Allaah knows best.