Understand his character first, don't invite him to dinner, it is meaningless. After asking about the home address, prepare cash and a small amount of gifts to wait outside his home, call him and tell him that XXX has some special products for him to taste.
If he shirks that he has arrived home, you can say that I have been waiting for you outside your house for a long time. There is no other meaning but to thank him for his help. (It's just a courtesy, with or without practical help) You can't go home when you get to his door.
Gifts are just excuses. If you take cash directly, you can say that you don't know what his children like, so you have prepared some money to buy it yourself. Briefly explain your needs, don't stay at his house for too long, and then get up and leave.
Submitted by the trustee
That is, entrust a third party to deliver the gift to the recipient on its own behalf. When it is not suitable for me to give gifts in person, this form can show that I attach great importance to it, or can avoid some formality and embarrassment of the other party. However, when handing over gifts, the trustee must explain to the recipient why the giver can't give generous gifts in person for just reasons.
It is best to attach a gift description to the gift and send it in person. This is the most common form of giving gifts. Its advantage is that it can improvise when making gifts, or Ian Yang's kindness, or introduce the meaning of gifts, or demonstrate the usage of gifts, which is helpful to give full play to the role of gifts.