Family law practices are usually limited to small and mid-sized private law firms. Some public service agencies, such as Legal Aid Societies, will represent indigent clients in family law matters. Family law matters can include pre-marital advice and planning; child-related issues such as custody, support, and visitation; divorce planning, negotiation and/or litigation involving support, spousal maintenance, or division of property; and post decree modifications and enforcement. Those engaged in a family law practice are very skilled counselors and negotiators, whose success is often dependent upon their ability to demonstrate genuine concern and compassion for their clients. Family law often involves trial work, and can overlap with many other areas of law such as tax and estate planning, real estate, corporate and finance, contract, and criminal.