How to set a Child transform same as to another child

Questions & Answers
1

i have 3 objects Object1,object2 and object3
object2 is the child of object1 already since start

using this lne of code i make object3 to be child of object1 successfully

object3 .transform.SetParent(object1 .transform.parent);

but i cant set postion of object3 same as object2, how can i do this plz help
i try this below code but it doesnt work for me

object3 .transform.position = object1 .transform.localPosition;
object3 .transform.eulerAngles = object1 .transform.localEulerAngles;
2

object3.transform.localPosition = object2.transform.localPosition;
object3.transform.localRotation = object2.transform.localRotation;