No, their parent(s) or guardian(s) are responsible.
Children become responsible for their own medical bills at the age of 18. This means that any bills that are incurred prior to the age of 18 are still the responsibility of a parent or guardian.
Parents are responsible for their children until they reach the age of majority or are emancipated.
It depends partially on the age of the children. If they are not adults, the parents are responsible. If the children are above the age of majority, and not on their parents' insurance, they should be responsible for their own debts.
You are responsible for your own medical bills.
The estate is responsible for all the debts of the deceased including dental bills. The children are not required to pay them from their own pocket.
The question answers itself. People over the age of 18 are not children. They are adults and as such are responsible for their own debts. Insurance coverage under your policy does not imply legal financial responsibility on your part.
They are not responsible to do it with their own money. If you are the executor of the estate, yes, insomuch as there are assets to pay them with. If the debts exceed the assets, there are some people who will not get paid, including the beneficiaries.
It would seem logical that she would be responsible for her own medical bills. However, if your father is still married to her, he may have substantial responsibility for her medical bills. If your father has died but there are provisions in his will that call for portions of his estate to support her medical needs, or if there is insurance covering her, then others may have some responsibility.
The estate is responsible for all the doctor bills of the deceased. The children are not going to be required to pay them from their own funds, but it will reduce what they inherit.
An adult is responsible for his own agreements, unless another person co-signed or signed as guarantor.
You would be responsible for your own medical bills. You are probably being treated as a self employed taxpayer (contract worker). You will have to deal with the payer of your services about this matter.
That depends on the specific situation. If the child is still on the parent's insurance, the parents will be responsible. But once they are on their own, it is their issue.