Al-Imaam
Ibn Baaz رحمه
الله was asked the following
Question:
The
Question: I am interested to get married to my female cousin and she too is interested whilst on the other hand my male cousin is interested
to get married to my sister and likewise the same for her. This is based
upon the fact that the guardians of each family are pleased with it, (I mean both parents).
The point is that all members from both sides are completely pleased with it
and there are no conditions between us. Also, we acknowledge that the
marriage of "Shighâr" is haraam. However, what we
request from you O' Noble Sheikh, (may Allaah preserve you), is that you
direct us to a safe and upright way (in performing the marriage), in order that
the marriage be valid, so that we will be safe from falling into the marriage
of "Shighâr" and from falling into sin and unlawful acts. Also, is it necessary that each one of the spouses gives more (dowry) than the other?