Tintype photo is likely Hyrum, Eliza and Joseph Minson

This picture is not labeled, but I believe the children in this picture are Hyrum , Eliza and Joseph Minson.  They look to be between 9 and 12 years old.   If it is them, it would have to have been taken before Sep 1881.  

Joseph (1869) Hyrum (1871) and Eliza (1872) were born just three years apart so their ages would be similar to the picture..   

Hyrum was born in 1871 and died in September 1881, just 10 years of age.  This picture we have of him looks almost identical to the boy on the left.             .

  Eliza in 1891.  The similarity I see is the shape of her face, nose and lips.
When I compare the picture of Joseph from two pictures when he was older, I see strong similarities especially in the hair line