I've been diabetic for 20 years and on the Medtronic insulin pump for about 2 years. I love the freedom it gives. It looks like you have gotten a lot of great advise so no need to repeat everything again. One thing I use is life savers candy. I prefer those over the glucose tabs. Have your pops carry some of those. I dipped into the 30's and wasn't responsive when my alarm went off so my wife called 911. Paramedics hooked up some IV in my bedroom. Within a few minutes I was back to normal. I don't remember a thing only a hot female paramedic working on me towards the end.
only a 2nd party should ever use glucagon...in other words, you use it on a diabetic who is already unable to swallow anything. it dumps the liver and will bring up sugar, but recovery from glucagon can take days of feeling like absolute crud until you can build up the liver stores again
anyway, everyone is different, but the rules are the same. Test a boatload of times daily until you get a pattern that is repeatable and predictable...and even then sometimes this is impossible in 'brittle diabetics'
type 1 blows but things could be worse. this is treatable to the point of no further health effects but it takes diligence on the testing....and test strips are not always cheap