How many boats at our dock???

We always have two boats at the dock ourselves, but recently there were some visiting boats at the dock at the same time!! Have you figured it out yet?? It's not too tricky. :o) 

I will put an extra of my brother-in-law waving goodbye as his son drove the boat away from our dock this afternoon. We will see my sister & family again tonight for dinner! 

There are 2 back-blipped entries before this one if you have time :o)