Food Suggestions - dad has adenocarcinoma in his oesophagus

Hi all, 

Hope everyone is keeping well and kicking cancers ***! 

My dad recently got diagnosed with adenocarcinoma in his osophagus. It started with an ulcer and the difficulty of breaking down food and frequent reflux. 
He is about to start a combination of chemo and radiotherapy. It is believed to be curative (fingers crossed).

I can see that he is very stressed out as he is really struggling to eat and is always hungry. He complains that near enough everything he eats gives him problems, and typically takes him a very long time to complete a meal. 
Does anyone have any suggestions to what food is most comfortable to eat in this given situation? 

Thank you so much for your help!