Have you considered how expensive is it not to put them in a care home? When you are personally liable for everything those people do and experience because you're their legal guardian? At some point you may have to quit your job to take proper care of them. Can you afford that?
> Here in Germany it is standard to put old people in care homes and complain how expensive they are.
Yeah. Well, go figure. 24/7 care is 3 people working shifts taking care of someone, or being at least on standby. Your payment goes for a wage of minimum 3, facility heating, electricity, their expenses, food, and so on.
If you don’t want to be a dead weight to your children, you have options. You can pay extra money privately into the system, or you can buy a house which the retirement provider will happily accept as a payment, or your children can sell, or accumulate wealth in another way. However, as being rich or owning a house is quickly falling out of fashion, your options could be a bit limited.