Explanation:

- Option 1: David Cooper: He was a British psychiatrist who viewed traditional family structures as a means of perpetuating social control and maintaining the status quo in an exploitative society.

- Option 2: Edmund Leach: An anthropologist known for his work on social structures, but not particularly associated with the idea of the family as an ideological conditioning device.

- Option 3: Friedrich Engels: He explored the role of family in a capitalist society, suggesting it supports capitalist structures by maintaining inheritance and patriarchy.

- Option 4: R.D. Laing: Another British psychiatrist, known for his views on mental illness but not specifically on the family as an ideological tool.