hi there

My daddy has suffered from stroke(hemorrhagic stroke) since 26 of October.He is 80 years old.He is doing physiotherapy.he is starting to walk but he found difficult to bend his knee.and he always walk with inflexible leg.Furthermore, he doesn't move with facility his right arm.The most important for him is to start to walk more regular.Is any exercise that will help him to improve his walking? he must to wait? or he is not going to have any further progress.

Thanks for your attention
I am looking forward to hearing from you any advice
Katerina