Who is the Holy Ghost?  The Holy Ghost is a member of the Godhead, and along with the gifts of being able to repent, and the gift of a personal resurrection, is the greatest gift given to mankind.  These three gifts surpass all, and are available to every soul who is willing to receive them.

The Holy Ghost is a gift bestowed by proper priesthood authority upon every person who repents of his sins, takes upon himself Christ's name, and is baptized.  Thereafter this third member of the Godhead becomes his constant companion.  That companion is ever present with that worthy person to warn him of dangers, to testify of truth, to comfort him when distressed, to guide in decision making, to inspire him with new thoughts, to give revelation and knowledge, and to be his guide and his helper in every step of life and in every endeavor.

There are 17 million members of the Church in the world.  Not all of them are worthy of this daily companionship, but the Holy Ghost has the constant responsibility of many millions of people.  How does He do it?  How can He do it?

The Father, the Son, and the Holy Ghost are one.  This is repeated over and over again in the scriptures.  They are separate individuals, but are united in thought, purpose, power, and methods.

The Father and the Son have bodies of flesh and bones.  The Holy Ghost does not.  The Holy Ghost is a personage of spirit, and must be a personage of spirit.

The scriptures also admonish us to become one with the Father and the Son.  Could we become one with Them like the Holy Ghost is?  That is what we're apparently admonished to do.  For what purpose?  To be their helpers?  Many are the stories of people who have been ministered to by deceased relatives.  We're told that they are near, and that they are very aware of us.

Are these departed relatives being helpers to the Holy Ghost, or are they actually the Holy Ghost that is assigned to that individual?

I think it very possible that after this mortal life we may become so closely aligned with the Father and the Son and their purposes that we might become the constant companion to a beloved grandchild.

If the Holy Ghost is one particular individual whose assignment is to minister to every other individual in the world, does it seem fair or right that He must remain an unembodied spirit for all eternity so that He can continue to fill that roll?  Would it be fair or right that He could never marry nor have posterity, nor have a body, nor be resurrected?  These are basic gifts for all mankind, and are what the gospel plan is all about.  It seems ludicrous that those basic gifts and this plan would be denied to that one all-important individual.

It makes more sense to my mind to think that the Holy Ghost is an office, and an assignment, bestowed upon every worthy individual who perfectly aligns himself or herself with the Father and the Son and their purposes.  I personally would relish the idea of being a guide and a helper to my posterity.  I think that I have such influences around me, and I expect to be in a position in the next life to be such an influence to those that I love the most.