Not Great, Not Good, Just OK

So, Sam has decided that every day should be Mother's Day and has been  making me a card every morning.  This was yesterday's card.

Apparently Jack and Adrian (from school) are now a part of our family - haha!

Then I noticed the "ok"  by Hannah's name

Me:  What's this by Hannah's name?

Sam: OK

Me: What does that mean?
Sam: It means we have an OK family