Well, even if they weren't the Grandparents....these were two very devout and faithful individuals who never doubted God, never complained about him, but, were steadfast in their belief and trust in God.
The two were married for 50 years and were not able to conceive a child. In those days a childless couple was looked down upon, as if they were displeasing to God and therefore, barren. Both must have endured much spiritual torture, as well as outright taunting....and yet, they never wavered in their belief and devotion to God.
Both prayed daily that God should grant them a child...even well in to their old age.
When the angel of the Lord informed them that they would parent a child, they didn't even know if were to be a boy or a girl, but, they promised to bring this child as a gift to the Lord, to serve in the Temple.
Imagine....your whole life you've wanted a baby. People have avoided you, ridiculed you, humiliated you because you were barren. All of a sudden you have a child, in your old age, when most women can no longer bare children....and out of your great love for God, you willingly give this child away to serve Him. What a sacrifice that must have been.
God found these two married people worthy to be the parents of the Mother of God.
Why wouldn't you honor them?
If only we had an ounce of their faith, their steadfastness, humility and belief.
Lord, have mercy!