/*
consume JSON structure:
{
   "mother": {
       "name":"Susanne"
   },
   "kid": {
       "name":"Peter"
   }
}

constructors and accessors are omitted
*/

public class MotherWithKidDTO {
	private Mother mother;
	private Kid kid;
}

private class Mother {
	private String name;
	private Kid kid;
}

private class Kid {
	private String name;
	// private Mother mother; // if needed
}

@RestController
public class MotherController {
	@PostMapping
	public Mother createMotherWithKid(@RequestBody MotherWithKidDTO motherWithKid) {
		Mother mother = motherWithKid.getMother();
		Kid kid = motherWithKid.getKid();
		mother.setKid(kid);
		
		Mother created = motherService.save(mother);
		return created;
	}
}