N.J. Stat. Ann. § 44:4-103

In all cases where there are relatives and others not otherwise chargeable by law who are able and willing to support and maintain or contribute to the support and maintenance of a poor person, the county welfare board may contract with such relatives in consideration of the support and maintenance of the poor person whereby the relatives may undertake and obligate themselves to that end, or induce such aid and support as may be possible.