Frank Stimach and Baby Roy Stimach at Roslyn,Wa

Baby Roy.
I have another grave of the surname Stimach I will add here-
I was wondering if someone who was related to all these older graves placed the plastic flowers at their sites or if it was just a cemetery habit to put fake flowers everywhere?
Is there someone out there especially visiting Baby Roy?

 are they related? i would say the artistry of the stones is of a similar vein but graves not  next to one another.
these were in the St Barbara section of the cemetery.