These are the people that would automatically receive your property after your passing. Who are these exactly, and how they will receive your property may vary depending on National or State laws. In other words, your heirs-at-law are the people who automatically inherit your estate, even if there is no Last Will. Additionally, if there is a Will, it’s usually the heirs-at-law who have a better chance of contesting it.
See also: Right of Representation