test.go

package main

import "fmt"

type familyInterface interface {
	getFather() family
	getMother() family
}

type family struct {
	first_name  string
	last_name   string
	middle_name string
	birth_date  string
	father      *family
	mother      *family
}

func (f *family) getFather() family {
	return *f.father
}

func (f *family) getMother() family {
	return *f.mother
}

func imple(f familyInterface) {
	fmt.Print(f.getMother())
}

func main() {
	fm := &family{
		first_name:  "Ali",
		middle_name: "KAAN",
		last_name:   "ÜNAL",
		birth_date:  "2016/01/14",
		father: &family{
			first_name: "Ferdi",
			last_name:  "ÜNAL",
			birth_date: "1991/08/30",
		},
		mother: &family{
			first_name: "Tuba",
			last_name:  "ÜNAL",
			birth_date: "1988/06/22",
		},
	}
	imple(fm)
}