I went back today ( but too late to go indoors and do an EVP session, so I will go back in the next few days, and see if I get anything.
I did however go and take more photos, of both the tree line and of the window with the weird matrixing/reflection.
When I went back to the wooded area by the picnic benches, I found the culprit of the out of sort thing in the trees
Its an electric meter/power box.. so I was right in the sense that it wasn't paranormal ( one point for mom, 0 for son
) but it wasnt a tree like I thought with odd lighting
Now, i took about half a dozen photos of the window with different distance, angles ect, and I wasn't able to create the same matrixing... temp and cloud coverage was the same , but it was about 2 hours later in the day, so will try next time I go out.