How to make a wish to send my son to Guanyin Bodhisattva?

It's good to ask Guanyin Bodhisattva. The Book of Guanyin Bodhisattva makes it very clear that if you sincerely ask for Guanyin Bodhisattva, you will get it if you do good deeds. If you make a wish, you must say it in front of the Bodhisattva. If you can really have children, you must make your own wishes.

I can only provide a few examples for your reference: 1. If Guanyin Bodhisattva bless me and let me have a son, I will definitely fast and recite Buddha all my life. 2. If Guanyin Bodhisattva bless me and let me have a son, I will believe in Buddhism and study it all my life. If Guanyin Bodhisattva bless me to have a son, I will burn incense and worship Guanyin Bodhisattva every day. 4. If Guanyin Bodhisattva bless me to have a son, I will definitely come to this temple again and donate 10000 yuan to support the three treasures. You can choose one (or make up one yourself) and say it when you worship Guanyin Bodhisattva, and keep it in mind.

Don't say what you can't do, say it, and do it after you achieve your wish. In addition, you should accumulate more virtues, do good deeds and honor your parents, so that your wishes will be effective. This is the key.