I would put money on the OP and her children already having a much bigger carbon footprint than her elderly parents have ever had, or will ever have. As a number of people have said, including me - the parents would have come from a generation where they recycle bottles, they didn't have any plastic packaging, they bought fresh food, meat, veg, eggs, and fruit etc from the local shop or farm, and they reused everything til it fell apart. Which would have been several decades in those days. I still wear a cardigan I bought in 1988!
Many of our elderly relatives would have cycled and walked everywhere and probably got public transport if it was too far to walk or cycle, and they had VERY little electric gadgets. Just a TV and a hi fi... or a radio. And an iron and washing machine/twin tub that they only used a couple of times a week. Oh and a fridge and possibly a freezer. Possibly 7 electrical items!
No mobile phones, MP3 players/ipods, DVD players, Alexa, blu-ray players, sound bars, electric alarm clocks, fancy coffee machines, microwaves, toasters, tumble dryers, laptops, playstations, X-boxes, snack sandwich makers, desktop computers, electric kettles, cable TV/satellite TV boxes, internet modems, fans, and multiple Televisions (4 or 5 in some homes!) And thing like dehumidifiers, and white noise machines, and something 'on charge' half of the daylight hours! This is all in addition to the 7 items I mentioned! Some 20-odd EXTRA items that most of our elderly relatives would not have had!
Also, they didn't have any central heating. I remember the days of frost patterns on the inside of the windows as well as we didn't have any central heating. My parents and grandparents were very, very frugal. We didn't have even have a landline or a car until the early 1970s. Dad's job was 10 minutes walk away, mom didn't work - she was a SAHM...
My mom and my grandmother couldn't even drive - and neither could my aunties - all born before the mid 1940s. We had hardly any cars in the family and most people walked/cycled to work. The older generation born before 1950 have got an almost non-existent carbon footprint ... As has been pointed out people born 1980s and 1990s and after have probably already got a much bigger carbon footprint than the older people have ever had or WILL have and yet the older generation (75+) are constantly attacked. So nasty!