I agree with Jill's advice.
And, I can relate to your concerns and feelings. My FFIL complains about everything and if he had it his way, he would control everything in our lives. So, I feel your frustration and my heart goes out to you. I've learned through my experience, to keep things between me and my FI. We'll vent to each other, but in terms of his dad's opinion and advice, we just listen then do what we want anyway. It makes it a lot easier. .....in one ear and out the other, as they say.