Answer:
(Fatwa: 443/L=148/tl=1431)
If you have given your wife three talaqs and she was pregnant, in this case her iddah period is that she gives birth to her child. After passing iddah period, she can marry to any other man except you who is not her mahram though he is married or unmarried; hence she can do her second nikah with your brother. If the man whom she marries gives her talaq willingly after having intercourse, then only you can marry her again after iddah period.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
