Quiz – Siman 207

From whom do we learn that one who comes to comfort a mourner should not speak until the mourner begins conversation?

What should one not say to a mourner?

There are only 11 men in the city of Jantown. Two residents recently passed away, each in a different house in the city. One of the deceased's children was able to mourn inside of the deceased's home, and the other deceased had no relatives in the country to mourn him there. In which home should the city members maintain a minyan?

On which holiday is hallel unconditionally recited in the mourner's house, according to some opinions?