All members of a Premium for Family plan must reside at the same physical address. Unfortunately, if you are currently travelling abroad and want to start a Premium for Family plan to invite your family members, it won't be possible.
However, you can start your own plan as soon as you return home and invite your family members to join it.
Alternatively, if your family starts a plan before your return, you can join it as soon as you return home. Just follow the steps here.