Whaaten Do You Feel Happy?

Either "When Do You Feel Happy?" or "What *Makes* You Happy"

When do you feel happy ◎
When makes you happy X
What makes you feel happy ○
What makes you happy ◎
What do you feel happy X

I feel happy when I have a dinner with my family.

a -> []: "dinner" is a label for the event of eating a dinner meal. Thus either

I feel happy when I have a dinner meal with my family △ <- grammatically correct but unnatural
I feel happy when I have dinner with my family ◎ <- the most natural way

I always eat dinner alone on weekdays, but on weekend we cans I have a great time with talking and laughing eating dinner with my family.

weekend -> weekends: you mention weekdays (the label), so we mention weekends (the label):

I always eat dinner alone on weekdays, but on weekends ◎
I always eat dinner alone on the weekdays, but on the weekends ◎
I always eat dinner alone on the weekday, but on the weekend △
I always eat dinner alone on weekdays, but on weekend X


we can have a great time with talking and laughing -> I have a great time with talking and laughing eating* dinner with my family:

This entire entry is about you, so the most natural way to talk is to keep the subject on you. Thus we change it from "we" to "I".

*talking and laughing eating dinner = talking and laughing [while] eating dinner: "while" is omitted here and implied, though both are correct

Whaaten Do You Feel Happy?

I always eat dinner alone on weekdays, but on weekends we can have a great time withhen talking and laughing.

Whaaten Do You Feel Happy?

I always eat dinner alone on weekdays, but on weekends we can have a great time with talking and laughing.

Whaat Do You Feel Happy?

Or "What makes you happy?"

I feel happy when I have a dinner with my family.

"A" dinner makes it seem like a formal, unusual event, which I expect it isn't in this context.

I always eat dinner alone on weekdays, but on weekends we can have a great time with talking and laughing.