1. Language blessing: You can choose appropriate words or phrases to express your blessing to your parents-in-law, such as:

* I wish my grandfather a long life and good health.

* I wish my father-in-law happiness and all the best.

* I wish my parents-in-law more than a year and strong financial resources.

2. Written blessing: You can write some words of blessing, such as:

* I wish my father-in-law happiness and all the best.

I wish my parents-in-law good health and long life.

* I wish my parents-in-law happiness with more than one year's money.

3. Activity blessing: Organizing activities on special occasions such as birthdays and wedding anniversaries can express blessings to parents-in-law, such as:

* Organize a small family gathering and invite relatives and friends such as parents-in-law.

* Arrange a trip for the whole family to spend their holidays in a warm place.

Send a special gift, such as flowers, gifts or a special diary to your parents-in-law.

No matter which way you choose, the most important thing is to sincerely express your blessing and concern for your parents-in-law.