"I really want to meet you and your siblings, even though we've never met. I love you guys a lot!"
Here's a breakdown:
* tengo muchas ganas de conocerte a ti y tus hermanos: I really want to meet you and your siblings
* aunque nunca nos hemos visto: even though we've never met
* los kieroo muchoote: I love you guys a lot! (this is a playful, affectionate way of saying "I love you" in Spanish)
The phrase is expressing a strong desire to meet the person and their siblings and shows genuine affection for them.