How can I help keep my grandfather engaged and less bored?

My grandfather is a well-educated man who retired several years ago. My parents live abroad. I, on the other hand, has lived away from my home and still continue to. My bade mummy papa and her children aren't really kind to them, they rarely ever talk to them. Taking them along isn’t an option because my grandfather has an irrational fear of dying in a foreign land. While my grandmother loves to travel, she has to stay in our village because of him. I recently spent a couple of weeks with them after coming back to India and noticed that my grandfather seems bored and lonely. He’s become more irritable as a result. My grandmother, on the other hand, is quite content watching serials on her phone. She’s naturally cheerful, but my grandfather spends most of his time sleeping or going for walks. With winter here, he’s stopped going outside entirely. He is always talking to 'Google' asking it ways to treat his constipation, and recipes to make him feel strong. I’m heading back abroad in a few days, and I'm really worried about his well being. Any channels that you can perhaps suggest I can subscribe to on his YouTube? Or anything that can keep him busy and happy? (He doesn't enjoy Candy Crush.)