Mark 12 study questions

What are the connections between the parable of the vineyard and the song of the vineyard in Isaiah 5? (v 1 to 8) 

What are the things we should render to God? (v 17)

What will relationships be like in the kingdom if there is no marriage? (v 25)

Why is Jesus asking about why the scribes say Christ is the son of David? (v 35 to 37)