If your father-in-law gave you a really good suggestion that would save you much time and make your life much easier, would you accept it? Or would you reject it simply because it came from your father-in-law? If you follow the biblical example of Moses, you would accept it. Let’s face it, your parents and in-laws are older than you. It’s possible that with increased age they have increased wisdom.
Why not take advantage of their wisdom? I don’t mean that you must always do what they advise, but why not give them a good hearing and then consider the merits of their idea. If it looks good to you and your spouse then go with it remembering that it is your decision.