Is it obligatory to inform the fiancée and her family about kidney dysfunction, and what is the ruling of Islamic law on marrying a girl who is 14 years old and the husband consummating the marriage when she is 15 years old, knowing that she has reached puberty and the husband is 20 years old?

The majority of scholars are of the view that defects that necessitate annulment are those that prevent sexual intercourse, or repulsive or contagious diseases. What the questioner mentioned is not included in this. Some scholars believe that any defect that repulses the other party necessitates annulment. Accordingly, there is no obligation to inform the fiancée of this illness, but it is preferable to inform her to avoid future problems.

As for consummating the marriage with the wife at the age of fifteen, it is permissible according to Islamic law if she is able to endure sexual intercourse. If she is not able to endure it, then she should not be handed over. If there is a dispute about her ability, the reference point is trustworthy medical professionals.