Windflower, the rhyme finder was perfect. Sadly, the poem is not. I was trying to find words that start with each letter of his name, so here's the end result:
Daniel is DELIGHTFUL
He ALWAYS makes us smile.
He’s NICE to siblings and his friends,
His INVENTIONS do beguile.
His EYES so green, his smile so wide,
He fills us all with LOVE,
We just have to say HAPPY VALENTINE’S DAY
To the boy we are proud of.