Those who are not thankful do not deserve what they have. If you take things for granted, the day will come when they no longer are. And you will suffer their loss.
Some people are a blessing. They make life a little easier just by doing what they do. You know they care, and it is easy to care about them in return.
Others will challenge you. Their purpose is to test your resolve and bring out the best in response. Some become better, and there are those who will make you better.
Be grateful for your family. With all their faults, you share a connection with these people. They are the reason you did not come into this world alone.
Give thanks for your livelihood. It could all be gone tomorrow, and you would be forced to start all over. For now, it is the reason there is food on the table.
For these and so many other things we should give thanks. Remember those who must do without. Being entitled to nothing, we should be grateful for everything.