Answer:
Make or buy them something personal. Not just flowers and a card. But something that shows them you listen and hear what they like. Use statements the avoid saying "You" when you guys are having a disagreement. Text or call them saying how you hope they know that you DO care and love them. Check in on them even if they are having a good day. Share advice to help them in their everyday lives. When your mad at them simply say nothing and nod yes. This shows that you hear and respect them and value their opinion.