2 Riddles Per Day #26 : Special for 14th Feb!!

Hi! here is my special edition for valentine’s day!

1. This comes in many shapes, many colors, and many sizes. It is where you write someone your true feelings. It is, however, almost always flat. What is it?

2. You give it to your dad, and give to your mom. You give it to your sis, your brother, and even give it to your friends. If they give it back to you, then you both have one. You always have an unlimited supply. What is it?