...Although in the "Questions & Answers" Baha'u'llah has specifically
stated that non-Baha'is have no right to inherit from their Baha'i parents
or relatives, yet this restriction applies only to such cases when a
Baha'i dies without leaving a will and when, therefore, his property will
have to be divided in accordance with the rules set forth in the Aqdas.
Otherwise, a Baha'i is free to bequeath his property to any person,
irrespective of religion, provided however he leaves a will, specifying
his wishes. As you see therefore it is always possible for a Baha'i to
provide for his non-Baha'i wife, children or relatives by leaving a will.
And it is only fair that he should do so.