"...you also, as living stones, are being built up 

as a spiritual house for a holy priesthood,

to offer up spiritual sacrifices

acceptable to God through Jesus Christ."

I Peter 2:5

I've related before how as a youth we went with our father who was a student recruiter for Pasadena College to a camp in New Mexico.  In between camps, the few of us there met in a cabin for church.  Suddenly, the cabin shook and then in part fell down.  I thought it was an earthquake.  We cautiously exited it to find that one half had fallen off the foundation of mere log rounds.  "How firm a foundation," took on new meaning:

"How firm a foundation, ye saints of the Lord,

Is laid for your faith in His excellent Word!

What more can He say than to you He hath said,

To you who for refuge to Jesus have fled?

The soul that on Jesus hath leaned for repose

I will not, I will not desert to his foes;

That soul, tho' all hell should endeavor to shake,

I'll never, no never, no never forsake."

(John Rippon)

Without a foundation in Christ, we are but matchsticks ready to fall,
a house built on the sand.
  

Adam Clarke said, "...all the stones--sons and daughters, that constitute the spiritual building are made partakers of the life of Christ, consequently, they may...be called living stones, that is sons and daughters of God, who live by Christ Jesus, because He lives in them.  Every stone--son and daughter, being a spiritual sacrifice or priest, they all offer up praise and thanksgiving to God through Christ...are all acceptable to God.

John Wesley said, "Ye--Believers, as living stones--Alive to God through him, are built up--in union with each other; a spiritual house--Being spiritual yourselves, and a habitation of God through the Spirit; a holy priesthood--Consecrated to God and holy as he is holy; to offer up--Your souls and bodies, with all your thoughts, words, deeds, and actions, as spiritual sacrifices to God."

They beg grandpa to tell them Bible stories

helping to build upon the foundation.

I don't know about you, but I like it when it says, "a spiritual household."  It's about the family, not just kinfolk, but the family of God.