Firstly, at 48 if he hasn't been engaged in physical activity for a while please get him to a GP for risk stratification. A clearance is always good, and there's no harm checking BP/Cholesterol/Trigs etc.
Secondly, start off slow. If he is carrying a lot of weight (102kg at 5'3) is pretty big unfortunately. The joints won't be happy with this.
Good to see you're looking out for him. He really needs to be less than 80kg for that height. (Irrespective of muscle mass - he isn't a bodybuilder by what I can see). Honestly Tregs, get him to start off slow. Compound movements, some non-weight bearing cardio to start with (until he builds strength, endurance, stamina).
Also, you can disregard anything said if you're not working on his diet. Seriously, he won't eat veg? He's a grown man. I'm not saying go from his current habits and do a complete 180, but his eating habits NEED to change. Replace any in between snacks like pies/pastries/biscuits/sweets/shit with 2 protein shakes if need be (whole foods are preferential, but so long as he is getting 3 solid nutrient dense meals in - 2 protein shakes to stave off any cravings will help - particularly if he's a sweet tooth).