Answer:
(Fatwa: 470/322/H=1432)
It is not lawful to send her with them. According to Shariah, your brother and brother-in-law are not mahram for your wife. It is wajib for a woman to accompany her husband or a mahram in hajj journey.
Allah (Subhana Wa Ta’ala) knows Best
Darul Ifta,
Darul Uloom Deoband
