Hi, Your brother in law got operated for bilateral inguinal hernia
10 years back, and since 2 years getting pain of groin and legs.
it doesn't appear to be concerned with previous operation. It looks like problem with the hip joint. I to my patients with such symptoms prescribe neurotropic injections , for 5 days, ofloxacin
BD,and antiinflamatories BD. So i advise you to consult an orthopedic surgeon for treatment.