Wa `alaykum As-Salamu wa Rahmatullahi wa Barakatuh
This can be done in many forms. You can either visit him at home or care for him at certain times. Hire someone to care for his medical needs or cleaning house or making food etc.

 

Sometimes you can help financially.

 

But make sure at least to keep visiting him if you cannot be with him always.

 

Almighty Allah knows best.