During the conversation, they have come to the front of the parents.
Traditionally, newcomers serve tea to their elders, which also has rules. Different families have more and more strict rules.
The elders tolerated this daughter-in-law when they drank tea and gave her a gift, but if she encountered difficulties in serving tea, the little daughter-in-law would have to bear hardships when she entered the door. If she didn't even take the tea, it would mean a lot.
The offering of tea at an engagement dinner is different from the invitation to tea after marriage. One outside, the other inside, copes with it differently.
To serve tea to the outside...