The ruling on one who performs 'Umrah on behalf of his deceased father and then intends to perform Hajj

Question:
A questioner asks: Is it permissible for me to perform 'Umrah on behalf of my deceased father during these days, which are the months of Hajj? And if I intend to perform the obligatory Hajj after that, will it be ifrad or tamattu'?

Answer:
Performing 'Umrah on behalf of your father and Hajj on his behalf is an act of dutifulness toward him, and you will be rewarded. If you perform 'Umrah during these days and then return to your family, and then return to perform Hajj as ifrad, it is Hajj ifrad. However, if you do not return to your family, but go to other places, and then return to perform Hajj, you will be a mutamatti' and you must offer a sacrificial animal.