Well Bill for a Family name (mine is also Fields) I thought I would give it a little shot
First thing I did was duplicated the layer and overlayed it as multiplied
Then I took the green channel and made it black and white from there.
The two little girls on the far right side both are completely missing their heads. Actually was a little freaky to realize

So I cut them out!
Did some basic cleanup with the healing brush to minimize some of the cracks and some of the stains.
Unfortunately I don't know the equivalent steps in Paint Shop Pro. But it is at least partially fixable

From here I would get deeper into the nitty gritty cloning and fixing, but that is what takes the longest
- Noel