Four Grizzly Bears?

How many grizzlies

If my memory serves me there are four grizzlies in this photo.  They are Bella and her two cubs plus another sub-adult. Actually there were two sub-adult siblings that came to the Glendale River estuary and they played with Bella’s cubs. We (the guides) were not able to identify the siblings but thought they must be related to Bella or she would not have been so friendly or allowed them to play. In the spring (June and July) there are a number of bears that make the river estuary their home plus bears that are travelling through and may stay for a few days or weeks.