Answer:
67 inches
Explanation:
Let's call the height of Louise 'L', the height of Miriam 'M' and the height of Jeffery 'J'.
Then, we can write the following equations and inequations:




Substituting J in the second and four inequations, we have:


If we assume the maximum value for M, in the first inequation we have that:

So the height of Uncle Louise is greater than or equal 66, and lesser than or equal 68, so his height could be 67 inches for example.