Most of the usual classroom games can be adapted for 1 to 3 people. e.g. I have 64 one to one games adapted from my 101 English Language Games for Children.
I wrote an article on tips to liven up one to one games (including teaching 2 or 3 students) - maybe there will be something there that will help you.
How to teach a child to speak English.
These posts are all on
private tutoring
All the best
Shelley Vernon