Over my years at Perform, I've found the Yes or No game really useful in helping children to develop their vocabulary and communication skills - why not have a go at home?
Explain that you are going to ask some questions, but they are not allowed to answer with either 'yes' or 'no'.
Start of with some easy questions, then progressively make them a little harder - e.g.
‘Do you have any brothers and sisters?'
‘Do you like school?'
Keep it light-hearted and fun. If the answer 'yes' or 'no' simply laugh and say 'oops try again'. If you like, you can swap over and have them ask you some questions too - just remember the rules!