Don't get me started on Meeroos.
Yes.
From the OP we know:
Son carries (since he shows) Balinese Cream Lynx.
Mom carries (since she shows) Balinese Cream Lynx.
Mom carries (since she has a parent showing) Foxie Salt and Pepper.
This fully describes Mom; she can't carry anything else.
Dad carries one of: Balinese Cream Lynx, Pandie Brown and White, Foxie Soft Black, or Foxie Salt and Pepper. We know this because Son shows Balinese Cream Lynx.
Son hides one of:
Balinese Cream Lynx
Pandie Brown and White
Foxie Soft Black
Foxie Salt and Pepper
When back-breeding Son to Mom the odds for a given box from them showing Foxie Salt and Pepper are either 0% (it can never happen) or 25% (it should happen every now and then).
Often you can examine Dad to determine if the odds will be 0% or 25%. But sometimes you still can't tell.
Failing that, all we can say is that usually, 2 out of 3 times, the odds, per box, will be 0% and sometimes, 1 out of 3 times, they'll be 25%.
What I can say, while trying will often fail, it is actually a good idea .. IN THE LONG TERM.
While you probably won't see Foxie Salt and Pepper, there is actually a decent chance you'll see Pandie Brown and White or Foxie Soft Black .. if you ever do see them, they came from Dad and Son (fully describing both) and are guaranteed to hide your goal of Foxie Salt and Pepper. Half of those will be grandsons. When this occurs, your best course of action, to produce Foxie Salt and Pepper is, as soon as possible, drop Son and switch to breeding Mom to that grandson.
What you'll probably see is a LOT of Cream Lynx. About 1 in 3 of those will hide Foxie Salt and Pepper. Your best course of action, here, is, as soon as you have a boy and a girl, get them cooking, too. And so on, down the generations. If you get enough of them, you should, eventually, see Foxie Salt and Pepper .. but you could lose it entirely and never be able to see it .. and you won't even know if THAT happens!