Mattea's Birthday

Today is Mattea's birthday! This drawing in particular makes me wonder about the relationship about these two. I may have mentioned before that Mattea is actually based off of my manager. My manager who apparently turns out to be the nephew of a family friend and her family (small world, I know). What I am thinking is having Mattea possibly be a long-lost family member of Cassandra. Oh and by the way, Mattea's dog is a Bichon Poodle, considering giving it a name, but it will probably appear only in a few flashbacks or something.