What is communion?
That is a great question and one that we should be ready to explain to our kids when they ask. Here is the most clear passage to use with your children:
1 Corinthians 11:23-26
For I received from the Lord what I also delivered to you, that the Lord Jesus on the night when he was betrayed took bread, and when he had given thanks, he broke it, and said, “This is my body, which is for you. Do this in remembrance of me.” In the same way also he took the cup, after supper, saying, “This cup is the new covenant in my blood. Do this, as often as you drink it, in remembrance of me.” For as often as you eat this bread and drink the cup, you proclaim the Lord’s death until he comes.
The disciples (now us) were commanded by Jesus Christ to continue to do this so we would remember what He did for us. The symbolism and taking of the elements (bread/wine) allows us to proclaim the gospel, good news of Jesus’ life, death, and resurrection, until he returns. While explaining the symbolism may be way beyond their grasp right now, it is good for them to know what the symbols stand for.
Who can take communion?
Believers in Christ. Those who have professed a faith in the Lord Jesus Christ.
Why do we do it?
To honor what Christ has done for us in His sacrifice on the cross for the forgiveness of our sins.
To reflect and examine our own hearts and confess our sins to God.
It helps us to stay intimately connected to Christ and remember what he has done for us.