Tang Nuanning was startled,
"You have a way? What way?"
Tang Little Eldest said, "Since he's irritable and has autism, and he strongly resists strangers, you shouldn't just appear in front of him boldly. You should first let him know you're a good person, who won't hurt him, to make him feel positive about you, and then you can get closer to him."
Tang Nuanning considered it seriously, and Little Eldest's idea seemed sensible.
Only...
"If I don't meet with him, how can I make him know that I'm a good person?"
"Help him quietly, or show good intentions proactively, make some food he likes, or playthings, and have his family give them to him."
"But I don't know what he likes to eat, nor what he likes to play with. From what his family says, apart from things about his mommy, he's not interested in anything else."
"That's okay, the purpose of showing good intentions is to let him know you have no hostility towards him and won't hurt him. That way you can gradually approach him."