['My friend has been taking care of his elderly mom, going to school and work full-time.', "Wow, that's amazing of him, it must be really hard.", 'It is hard for him. I try to help, when I can.']
That's really kind of you, I bet he appreciates all the help he can get big or small.
My friend has been taking care of his elderly mom, going to school and work full-time.