Celebration of family reunion can better correspond to the laughter and laughter of He Xinchun, the first part of the couplet, because the couplet pays attention to one-to-one correspondence, and the scope of celebration is relatively large, corresponding to He Xinchun, so it should be placed in the first part.
The upper couplet refers to the first half of the couplet, which is generally composed of the upper couplet and the lower couplet, and there are horizontal batches.