A person with Neptune in 4th House has the following characteristics:



He/She has a desire to gain inner security and healing space and tries to obtain a proper house to realize long-standing dreams or hobbies there.



He/She prefers to live by the sea or water.



Besides, there is an implication that the house in which he/she lives might have some involvement with water issues, so beware of water leaks, flooding, etc.



He/She is more likely to show sympathy to others, so by providing dwelling as a shelter to friends or acquaintances who have trouble making a living, they can settle in his/her house for quite a while unwantedly.



In his/her childhood, there may be a lot of confusion derived from the changes in family structure or residence.



By the divorce, separation or death of his/her parents, he/she could lose one or both parents.



Alternatively, he/she could be raised as an adopted child by foster parents or in orphanages.



Additionaly, those facts might have been hidden for a long time.



If he/she doesn't have parents, he/she tends to idealize them as ideal parental figures.



On the other hand, when he/she lives with his/her parents, he/she shows sympathy for them.



Besides, even if they cannot give him/her adequate care, he/she conveniently interpret them for any reason and can even feel compassion on them.



His/Her parents might be the person who pursue dreams and ideals and less represented.



In the worst case, they can be addicted to alcohol or drugs.