Nobita was siting at his study table once he was suddenly thrown away by the table one round robot came out of it and one like nobita also came out of it . He said"my name is shivashi and this is my friend doremon he live with you ,i am your grand grand grand son

Nobita : I am studying in 4th class and how could i be a great grand father

Doremon : we came from 22th century

Shivashi : That mean we traveled in time and came here .

Nobita served them Dora cake

Doremon : what is this

Nobita : it is called dora cake

Doremon : It is yummy

Shivashi : Ok grand pa i am going