Hello,
What you have said is not true, it is not allowed for Baha’is to wed daughters and sisters, this saying is an invention of people who are opposed to the Baha’i faith.
Baha’is have obligatory prayers and fasting and Baha’u’llah admonished the rich saying, “the poor in your midst are my trust, guard ye my trust and be not intent only with your own ease”