Well everything will be fine. You shouldn’t be so negative about this situation. Everyone has their off days and no one will scold u. Remember your not a chef but a wife
You don’t know until you cook whether they like it or not. If they don’t, you can always learn. Don’t panic just relax
You will do good just be confident
Cook anything with love, trust yourself. You can always take help from youtube there are many easy recipes available, you can ask your mother-in-law for suggestions. I am sure it will turn out to be really good.
Start with easy cooking.