If the breadwinner in the family dies in an accident caused by someone else, then the dependants of that person can claim for loss of support.

A dependant is someone who depends on someone else for food, clothes, shelter, and so on. You will only succeed with a third party claim as a dependant if the breadwinner had a legal duty to support you. For example, the widow of someone who dies could claim compensation for herself and the minor children of the deceased. But you wouldn’t be considered a dependant of your friend who helps you with money every month.