Step son making me lunch

I am engaged to a Chinese man. He has 2 kids. A 10 year old daughter an 14 year old son. His wife died 3 months after having their daughter. His son is the only one who remembers her. I'm mixed with black and white and his family doesn't approve of me. They want him to marry a chinese wpmen and don't like that I dont have a strong bond with his son because his son is the only child who remembers their mother. Me and his daughter get along well. His son is very shy and reserved. They recently told me I know nothing if their culture and I'm gonna brain wash the kids. His son enjoys cooking and last week when I was heading to work in the fridge in tubble wear were chinese dishes and my step son wrote the name, how to pronounce it, and what's in it. Then signs his name. He's been doing this for me for a week and he still doesn't really speak to me. I really want to thank him and nreal the ice some how.