It sounds terrifying, and it certainly isn't pretty, but it omits all relevant information. The height of those "meagre" pensions (insanely high compared to even the Greek economy before the collapse), the age of those retired grandparents (often much younger than people that can't afford to retire in countries currently financially supporting Greece) the number of those "rest of the family members" and the sizeable black economy those family members use to supplement that income.
The whole system is terrifying, but the reality is that Greeks aren't starving in the street and this insane system needs fundamental reform to prevent that from happening.
If Greece asked for billions to feed their population they would get it, but they want us to finance keeping this system up. A systems that haemorrhages money so badly it makes aid to developing nations in Africa look like the summit of effectiveness.