Cook a good meal at home and order a cake. You'd better show filial piety to your parents-in-law, buy a dress or send something commonly used at home. When eating, you can drink a little wine properly and say some words of blessing, such as: Mom and Dad, your's parents have worked hard these years. I wish you good health and smile often in the future. In fact, everything is secondary. As long as you are more considerate of your in-laws and less quarreling in your daily life, everything will be fine.