My Father-in-Law ; Mother-in-Law had performed the Hajj this year. Insaallah their Hajj is accepted; Niyaat will be accepted to the Almighty Allah. Meanwhile, my father and mother both are alive are physically fit. They had not yet performed Hajj yet My Mother-in-Law and Father-in-Law informed us that they performed Umrah Hajj on behalf of my parents.
My question is, Is it valid ?