Is it permissible to marry a girl who suffers from a hump in her back and whose brother is a dwarf, despite the parents' rejection out of fear of inheriting the disease?

If the parents, or one of them, forbid their child from marrying a specific woman, and the prohibition is due to a flaw in the woman's religiosity or character, then obedience to them is obligatory. However, if the prohibition is without a valid reason, then obedience to them is not binding, and the son is not considered disobedient to them.

It is advisable to strive to convince the parents of the righteous woman, or to intercede through someone who has influence with them. If they insist on refusal, then he should turn away from her and seek another woman whom the parents approve of.