When lord Capulet sees Juliet in her death like sleep he says that Paris will not be her groom because she has married?
He says that death has been her bridegroom.
The father, because he is the one who had organised the marriage at first between Paris and Juliet, he makes the desicions in the Capulet household and he is the person who moves the date of the wedding one day earlier. He is also forcing Juliet to be married because in one of the scenes Juliet disagrees in marrying Paris and Lord Capulet says that if she were not to marry him he will disown…
Capulet plans the marriage with Paris because when Romeo is banished from Verona for killing Tybalt, and Juliet is crying, he thinks that Juliet is crying because her cousin Tybalt is dead, when instead she is crying because Romeo has been banished. So to cheer her up, he insists she gets married in 2 days.
Paris. After Paris talks to Capulet, he gets Mrs. Capulet to break the news to Juliet. Clearly she and Juliet have not previously discussed the question of marriage (she is only thirteen) when she says, "How stands your disposition to be married" and Juliet replies, "It is an honour that I dream not of." Mrs. C then tells her that Paris is interested in marrying her.
In Act 1 she tells her that Paris is interested in marrying her and that she can look him over at the ball. Later she tells Juliet that Capulet has decided that Juliet should marry Paris. And she also tells Juliet not to worry about Romeo because Lady Capulet is going to hire an assassin to bump him off.